HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news

Cheap flights from St. Louis to Seattle (STL - SEA) from $109

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/20. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
STL — SEA
May 19 — May 261
From?
To?
Sun 5/19
Sun 5/26
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

The best prices from Lambert-St Louis to Seattle/Tacoma Intl are usually found in February or January, booked 81 days in advance, depart on a Thursday or Monday and return on a Tuesday

Cheap flight deals from St. Louis to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 14, 2024.

Popular in

July

Cheapest in

February

Round-trip from

$247

One-way from

$135
High demand for flights, 32% potential price rise
Search Deals
Best time to find cheap flights, 29% potential price drop
Search Deals
From Lambert-St Louis to Seattle/Tacoma Intl
Search Deals
One-way flight from Lambert-St Louis to Seattle/Tacoma Intl
Search Deals

What is the cheapest day to fly round-trip from St. Louis to Seattle?

Leaving on a Wednesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 18% on the overall cost on flights from St. Louis to Seattle.

How far in advance should I book a flight from St. Louis to Seattle?

Find a great deal and save up to 14% by booking at least 56 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from St. Louis to Seattle within the next two weeks, with the cheapest ticket starting at $278.

What is the cheapest month to fly from St. Louis to Seattle?

Flights from St. Louis to Seattle lean towards being more expensive in July. Prices are generally better when you fly from St. Louis to Seattle in February, with the cheapest ticket starting at $133.

When is the cheapest time to fly from St. Louis to Seattle (STL - SEA)?

Unlike in the evening, when flights are generally more expensive, you can save up to 30% on flights from St. Louis to Seattle by exploring options for tickets in the afternoon.

Cheap American Airlines flights from St. Louis to Seattle

Explore cheap flight options specifically provided by American Airlines for the route between St. Louis and Seattle. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,632,958 searches. Data last updated May 14, 2024.
Peruse some of the lowest-priced American Airlines flights we've found from St. Louis to Seattle. Deals update often to give you more flight options matching your criteria
Tue 8/204:18 pmSTL - SEA
1 stop9h 17mAmerican Airlines
Mon 8/2612:18 amSEA - STL
1 stop6h 46mAmerican Airlines
Deal found 5/13$198
Fri 9/64:17 pmSTL - SEA
1 stop8h 28mAmerican Airlines
Sat 9/145:00 amSEA - STL
1 stop6h 39mAmerican Airlines
Deal found 5/13$212
Wed 5/292:00 pmSTL - SEA
1 stop9h 56mAmerican Airlines
Mon 6/31:15 amSEA - STL
1 stop7h 22mAmerican Airlines
Deal found 5/13$225
Wed 5/295:08 pmSTL - SEA
1 stop7h 57mAmerican Airlines
Mon 6/31:15 amSEA - STL
1 stop7h 22mAmerican Airlines
Deal found 5/13$251
Tue 6/45:21 amSTL - SEA
1 stop7h 28mAmerican Airlines
Sat 6/812:20 amSEA - STL
1 stop6h 34mAmerican Airlines
Deal found 5/13$317
Tue 5/215:55 amSTL - SEA
1 stop8h 31mAmerican Airlines
Mon 5/271:15 amSEA - STL
1 stop7h 22mAmerican Airlines
Deal found 5/12$332
Wed 5/226:18 pmSTL - SEA
1 stop7h 57mAmerican Airlines
Sat 5/251:15 amSEA - STL
1 stop7h 22mAmerican Airlines
Deal found 5/13$357
Fri 5/245:08 pmSTL - SEA
1 stop7h 57mAmerican Airlines
Mon 5/271:15 amSEA - STL
1 stop7h 22mAmerican Airlines
Deal found 5/14$376
Fri 5/244:20 pmSTL - SEA
1 stop8h 21mAmerican Airlines
Mon 5/271:15 amSEA - STL
1 stop7h 22mAmerican Airlines
Deal found 5/13$445

  • If you’re traveling from St. Louis to Seattle, one of the more common airlines traveling that route is American Airlines. Flights from American Airlines traveling this route typically cost $397.52 RT. This price is typically 50% more expensive than other airlines that offer St. Louis to Seattle flights. When booking this route, the cheapest RT price found was $168. The most popular departure airport in St. Louis when flying to Seattle is Lambert-St Louis Airport. The most popular airport to fly into when visiting Seattle is Seattle/Tacoma Intl Airport. When flying from St. Louis to Seattle, American Airlines flights are 11% more popular than any other airline flying that same route.

Cheap Delta flights from St. Louis to Seattle

Explore cheap flight options specifically provided by Delta for the route between St. Louis and Seattle. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,632,958 searches. Data last updated May 14, 2024.
Take a gander at the lowest prices we've found on Delta flights from St. Louis to Seattle. Make sure to examine the flight information before completing your reservation.
Wed 8/286:59 pmSTL - SEA
1 stop6h 58mDelta
Fri 8/3012:30 amSEA - STL
1 stop7h 20mDelta
Deal found 5/13$216
Fri 9/66:59 pmSTL - SEA
1 stop6h 58mDelta
Fri 9/1312:30 amSEA - STL
1 stop7h 20mDelta
Deal found 5/13$221
Tue 7/210:05 amSTL - SEA
1 stop8h 20mDelta
Tue 7/911:55 amSEA - STL
1 stop8h 12mDelta
Deal found 5/14$226
Sun 8/46:30 pmSTL - SEA
1 stop7h 27mDelta
Sat 8/105:40 amSEA - STL
1 stop5h 45mDelta
Deal found 5/14$292
Thu 9/56:59 pmSTL - SEA
1 stop6h 58mDelta
Tue 9/1012:30 amSEA - STL
1 stop7h 20mDelta
Deal found 5/12$299
Mon 7/226:30 pmSTL - SEA
1 stop7h 27mDelta
Sat 7/275:30 amSEA - STL
1 stop6h 58mDelta
Deal found 5/13$302

  • One of the most popular airlines traveling from St. Louis to Seattle is Delta. Flights from Delta traveling this route typically cost $456.20 RT. This price is typically 47% cheaper than other airlines that offer St. Louis to Seattle flights. When booking this route, the cheapest RT price found was $176. Lambert-St Louis Airport is the most common St. Louis airport to take off from when flying to Seattle. Seattle/Tacoma Intl Airport is the most popular arrival airport in Seattle. When flying from St. Louis to Seattle, Delta flights are 1% more popular than any other airline flying that same route.

Cheap St. Louis to Seattle flights in May & June 2024

Find cheap flight options from St. Louis to Seattle specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,632,958 searches. Prices were last updated on May 14, 2024.
These are some of the most attractive deals on flights from St. Louis to Seattle in 2024. More deals are always being added, so be sure to check back regularly.
Wed 6/121:55 pmSTL - SEA
1 stop8h 14mSpirit Airlines
Tue 6/189:41 pmSEA - STL
1 stop13h 24mSpirit Airlines
Deal found 5/14$135
Sat 6/88:02 pmSTL - SEA
1 stop15h 08mMultiple Airlines
Tue 6/119:41 pmSEA - STL
1 stop13h 24mMultiple Airlines
Deal found 5/13$139
Wed 6/121:55 pmSTL - SEA
1 stop8h 14mMultiple Airlines
Thu 6/2010:58 pmSEA - STL
1 stop9h 44mMultiple Airlines
Deal found 5/13$143
Wed 6/121:55 pmSTL - SEA
1 stop8h 14mMultiple Airlines
Mon 6/1710:03 pmSEA - STL
1 stop10h 39mMultiple Airlines
Deal found 5/13$149
Tue 6/1111:57 amSTL - SEA
2 stops22h 35mMultiple Airlines
Tue 6/189:41 pmSEA - STL
1 stop11h 01mMultiple Airlines
Deal found 5/12$151
Tue 6/1111:57 amSTL - SEA
2 stops22h 35mSpirit Airlines
Tue 6/189:41 pmSEA - STL
1 stop13h 24mSpirit Airlines
Deal found 5/13$152
Sat 6/82:36 pmSTL - SEA
Nonstop4h 13mMultiple Airlines
Tue 6/119:41 pmSEA - STL
1 stop13h 24mMultiple Airlines
Deal found 5/13$161
Thu 6/137:29 pmSTL - SEA
1 stop15h 08mFrontier
Thu 6/2010:58 pmSEA - STL
1 stop9h 44mFrontier
Deal found 5/14$167
Wed 6/121:55 pmSTL - SEA
1 stop8h 14mMultiple Airlines
Tue 6/181:47 pmSEA - STL
2 stops18h 55mMultiple Airlines
Deal found 5/14$168

St. Louis to Seattle 2024 flight deals

Discover exclusive flight deals for travel between St. Louis and Seattle in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,632,958 searches. Data last updated May 14, 2024.
These are some of the most attractive deals on flights from St. Louis to Seattle in 2024. More deals are always being added, so be sure to check back regularly.
Wed 6/121:55 pmSTL - SEA
1 stop8h 14mSpirit Airlines
Tue 6/189:41 pmSEA - STL
1 stop13h 24mSpirit Airlines
Deal found 5/14$135
Sat 6/88:02 pmSTL - SEA
1 stop15h 08mMultiple Airlines
Tue 6/119:41 pmSEA - STL
1 stop13h 24mMultiple Airlines
Deal found 5/13$139
Wed 6/121:55 pmSTL - SEA
1 stop8h 14mMultiple Airlines
Thu 6/2010:58 pmSEA - STL
1 stop9h 44mMultiple Airlines
Deal found 5/13$143
Wed 6/121:55 pmSTL - SEA
1 stop8h 14mMultiple Airlines
Mon 6/1710:03 pmSEA - STL
1 stop10h 39mMultiple Airlines
Deal found 5/13$149
Tue 6/1111:57 amSTL - SEA
2 stops22h 35mMultiple Airlines
Tue 6/189:41 pmSEA - STL
1 stop11h 01mMultiple Airlines
Deal found 5/12$151
Tue 6/1111:57 amSTL - SEA
2 stops22h 35mSpirit Airlines
Tue 6/189:41 pmSEA - STL
1 stop13h 24mSpirit Airlines
Deal found 5/13$152
Sat 6/82:36 pmSTL - SEA
Nonstop4h 13mMultiple Airlines
Tue 6/119:41 pmSEA - STL
1 stop13h 24mMultiple Airlines
Deal found 5/13$161
Tue 8/277:29 pmSTL - SEA
1 stop17h 19mFrontier
Tue 9/37:51 pmSEA - STL
1 stop12h 27mFrontier
Deal found 5/13$166
Thu 6/137:29 pmSTL - SEA
1 stop15h 08mFrontier
Thu 6/2010:58 pmSEA - STL
1 stop9h 44mFrontier
Deal found 5/14$167

Non-stop flights to Seattle from St. Louis

Discover non-stop flight options from St. Louis to Seattle. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 2,632,958 searches. Data last updated May 14, 2024.
To help reduce your travel time, choose from one of these non-stop flights from St. Louis to Seattle. If you're looking for other options for flights from St. Louis to Seattle, make sure to update the search form at the top of page.
Tue 6/47:41 pmSTL - SEA
Nonstop4h 19mAlaska Airlines
Sat 6/85:58 pmSEA - STL
Nonstop4h 01mAlaska Airlines
Deal found 5/13$237
Tue 6/47:41 pmSTL - SEA
Nonstop4h 19mAlaska Airlines
Sun 6/95:58 pmSEA - STL
Nonstop4h 01mAlaska Airlines
Deal found 5/13$257
Mon 6/37:41 pmSTL - SEA
Nonstop4h 19mAlaska Airlines
Tue 6/117:37 amSEA - STL
Nonstop3h 59mAlaska Airlines
Deal found 5/13$258
Tue 9/247:00 amSTL - SEA
Nonstop4h 26mAlaska Airlines
Mon 9/306:08 pmSEA - STL
Nonstop3h 51mAlaska Airlines
Deal found 5/13$277
Fri 6/77:41 pmSTL - SEA
Nonstop4h 19mAlaska Airlines
Mon 6/105:58 pmSEA - STL
Nonstop4h 01mAlaska Airlines
Deal found 5/12$297
Tue 8/202:34 pmSTL - SEA
Nonstop4h 25mAlaska Airlines
Tue 8/276:08 pmSEA - STL
Nonstop3h 51mAlaska Airlines
Deal found 5/14$317
Wed 6/127:00 amSTL - SEA
Nonstop4h 14mAlaska Airlines
Wed 6/197:30 amSEA - STL
Nonstop3h 50mAlaska Airlines
Deal found 5/13$322
Mon 9/167:31 pmSTL - SEA
Nonstop4h 24mAlaska Airlines
Mon 9/237:37 amSEA - STL
Nonstop3h 56mAlaska Airlines
Deal found 5/14$327
Sun 6/22:36 pmSTL - SEA
Nonstop4h 13mAlaska Airlines
Thu 6/65:58 pmSEA - STL
Nonstop4h 01mAlaska Airlines
Deal found 5/13$342

St. Louis to Seattle flights leaving soon

Find last-minute flight options from St. Louis to Seattle for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,632,958 searches. Data last updated May 14, 2024.
Have a look at some of the flights available from St. Louis to Seattle departing last-minute. Users should double check the flight they book to ensure it matches the day, time, and destination they're looking for.
Fri 5/246:05 pmSTL - SEA
1 stop15h 35mMultiple Airlines
Tue 5/289:40 pmSEA - STL
1 stop11h 06mMultiple Airlines
Deal found 5/14$185
Wed 5/227:23 pmSTL - SEA
1 stop28h 49mFrontier
Sun 5/2610:59 pmSEA - STL
1 stop9h 14mFrontier
Deal found 5/13$207
Tue 5/2110:44 pmSTL - SEA
1 stop10h 20mFrontier
Tue 5/288:14 pmSEA - STL
1 stop11h 22mFrontier
Deal found 5/12$211
Fri 5/246:05 pmSTL - SEA
1 stop15h 35mMultiple Airlines
Tue 5/289:40 pmSEA - STL
1 stop11h 06mMultiple Airlines
Deal found 5/13$220
Fri 5/246:05 pmSTL - SEA
1 stop15h 35mMultiple Airlines
Sat 5/2510:08 pmSEA - STL
1 stop22h 24mMultiple Airlines
Deal found 5/14$243
Wed 5/227:23 pmSTL - SEA
1 stop28h 49mMultiple Airlines
Sun 5/268:45 amSEA - STL
1 stop6h 40mMultiple Airlines
Deal found 5/13$254
Thu 5/237:23 pmSTL - SEA
1 stop26h 41mMultiple Airlines
Sun 5/268:45 amSEA - STL
1 stop6h 40mMultiple Airlines
Deal found 5/13$264
Thu 5/235:21 amSTL - SEA
1 stop9h 32mAmerican Airlines
Sat 5/251:15 amSEA - STL
1 stop7h 22mAmerican Airlines
Deal found 5/13$317
Tue 5/215:55 amSTL - SEA
1 stop8h 31mAmerican Airlines
Mon 5/271:15 amSEA - STL
1 stop7h 22mAmerican Airlines
Deal found 5/12$332

One-way flights to Seattle from St. Louis

Search for one-way flight options from St. Louis to Seattle. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,632,958 searches. Data last updated May 14, 2024.
If you're seeking multiple options on one-way flights from St. Louis to Seattle, be sure to check out these deals, which are updated often. Those seeking round-trip flights from St. Louis to Seattle should utilize the search form at the the top of the page.
Mon 5/2010:21 pmSTL - SEA
1 stop13h 34mFrontier
Deal found 5/13$109
Thu 6/63:32 pmSTL - SEA
1 stop17h 34mFrontier
Deal found 5/13$110
Tue 6/256:25 pmSTL - SEA
1 stop7h 34mDelta
Deal found 5/13$113
Tue 6/117:41 pmSTL - SEA
Nonstop4h 19mAlaska Airlines
Deal found 5/12$119
Mon 7/112:05 pmSTL - SEA
2 stops26h 42mFrontier
Deal found 5/12$125
Tue 6/410:34 amSTL - SEA
3 stops23h 58mSpirit Airlines
Deal found 5/13$127
Tue 6/1111:57 amSTL - SEA
3 stops22h 35mSpirit Airlines
Deal found 5/12$129
Sun 5/198:15 amSTL - SEA
1 stop12h 25mSun Country Air
Deal found 5/13$133
Sun 6/166:30 amSTL - SEA
1 stop12h 25mSun Country Air
Deal found 5/13$135

Find flights from St. Louis to Seattle within your budget

Customize your flight search to find flights from St. Louis to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,632,958 searches. Data last updated May 14, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$135 - $295

Route

Depart

Return

Price

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Wed 6/12

1 stop8h 14m

Seattle/Tacoma Intl

Tue 6/18

1 stop13h 24m

$135

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Sat 6/8

1 stop15h 08m

Seattle/Tacoma Intl

Tue 6/11

1 stop13h 24m

$139

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Wed 6/12

1 stop8h 14m

Seattle/Tacoma Intl

Thu 6/20

1 stop9h 44m

$143

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Tue 6/11

2 stops22h 35m

Seattle/Tacoma Intl

Tue 6/18

1 stop13h 24m

$152

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Tue 8/27

1 stop17h 19m

Seattle/Tacoma Intl

Tue 9/3

1 stop12h 27m

$166

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Tue 8/20

1 stop9h 17m

Seattle/Tacoma Intl

Mon 8/26

1 stop6h 46m

$198

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Wed 8/28

1 stop6h 58m

Seattle/Tacoma Intl

Fri 8/30

1 stop7h 20m

$216

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Tue 6/4

Nonstop4h 19m

Seattle/Tacoma Intl

Sat 6/8

Nonstop4h 01m

$237

Lambert-St LouisSeattle/Tacoma Intl

STL - SEA

STLSEA

Lambert-St Louis

Sun 7/21

1 stop18h 02m

Seattle/Tacoma Intl

Fri 7/26

1 stop24h 50m

$295

Flights are sorted by cheapest first

Deals found on 5/14

When is the best time to book a flight from St. Louis to Seattle?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Seattle. Price data was last updated on May 10, 2024.
The best time to book flights from St. Louis to Seattle is 81 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Search Deals

When is the cheapest time to fly from St. Louis to Seattle?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Seattle. Price data was last updated on May 12, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their St. Louis to Seattle flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Average price of flights to Seattle by month

Plan your trip from St. Louis to Seattle by taking into account the cheapest months to travel. The average price of a one-way flight from St. Louis to Seattle is currently $122 while a round-trip flight costs $187. Price data was last updated on May 12, 2024.

Currently, January is the cheapest month in which you can book a flight from St. Louis to Seattle (average of $247). Flying from St. Louis to Seattle in July is currently the most expensive (average of $407). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

January

$247

February

$254

March

$288

April

$294

May

$318

June

$404

July

$407

August

$344

September

$278

October

$256

November

$258

December

$248

Temperature and rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average temperature and rainfall totals by month.

SEA

Temperature

41 - 66.2 °F

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated May 14, 2024.
See what other customers who have flown with American Airlines, Delta and Alaska Airlines from St. Louis to Seattle have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.1
Very good
9,152 reviews
Check prices

Crew

8.6

Overall

8.1

Food

7.3

Boarding

8.2

Entertainment

7.3

Comfort

7.9

Reviews

1 / 10

There were no major issues. A bit of delay but it was understandable. It was a good experience otherwise.

Alaska Airlines
8.1
Very good
9,152 reviews
Alaska Airlines
8.1
Very good
9,152 reviews
Check prices

Crew

8.6

Overall

8.1

Food

7.3

Boarding

8.2

Entertainment

7.3

Comfort

7.9

Reviews

1 / 10

There were no major issues. A bit of delay but it was understandable. It was a good experience otherwise.

Delta
8.0
Very good
10,706 reviews
Alaska Airlines
8.1
Very good
9,152 reviews
Check prices

Crew

8.6

Overall

8.1

Food

7.3

Boarding

8.2

Entertainment

7.3

Comfort

7.9

Reviews

1 / 10

There were no major issues. A bit of delay but it was understandable. It was a good experience otherwise.

United Airlines
7.4
Good
10,959 reviews
Alaska Airlines
8.1
Very good
9,152 reviews
Check prices

Crew

8.6

Overall

8.1

Food

7.3

Boarding

8.2

Entertainment

7.3

Comfort

7.9

Reviews

1 / 10

There were no major issues. A bit of delay but it was understandable. It was a good experience otherwise.

American Airlines
7.3
Good
14,561 reviews
Alaska Airlines
8.1
Very good
9,152 reviews
Check prices

Crew

8.6

Overall

8.1

Food

7.3

Boarding

8.2

Entertainment

7.3

Comfort

7.9

Reviews

1 / 10

There were no major issues. A bit of delay but it was understandable. It was a good experience otherwise.

Sun Country Air
7.2
Good
635 reviews
Alaska Airlines
8.1
Very good
9,152 reviews
Check prices

Crew

8.6

Overall

8.1

Food

7.3

Boarding

8.2

Entertainment

7.3

Comfort

7.9

Reviews

1 / 10

There were no major issues. A bit of delay but it was understandable. It was a good experience otherwise.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from St. Louis to Seattle?

    Booking a flight from Lambert-St Louis (STL) to Seattle/Tacoma Intl (SEA) is your only option if you wish to fly from St. Louis to Seattle. On a typical day, there are 6 flights from Lambert-St Louis to Seattle/Tacoma Intl, all of which are around 4h 13m for a nonstop flight. You can also purchase a plane ticket from 8 airlines when you book a flight from Lambert-St Louis to Seattle.

  • Can I find flights from St. Louis to Seattle for under $200 on Cheapflights?

    Yes, there are multiple flights from St. Louis to Seattle for under $200. The cheapest flight booked recently is on Spirit Airlines for just $135, but on average you can expect to pay $163.

  • Are there nonstop flights from St. Louis to Seattle for under $300 on Cheapflights?

    Cheapflights has at least 20 direct flights from St. Louis to Seattle under $300. A good price for a nonstop flight from St. Louis to Seattle is less than $355.

  • Are there last-minute flights available from St. Louis to Seattle for under $200?

    There are currently 20+ open flights from St. Louis to Seattle within the next 7 days for less than $200.

  • What days are nonstop flights available from St. Louis to Seattle?

    Nonstop flights can be found on the following days: Sunday, Tuesday, Wednesday, Thursday, Friday, Saturday.

  • How popular is this St. Louis to Seattle flight route?

    Within the past month, 58 users have taken a look at flights from Lambert-St Louis to Seattle/Tacoma Intl.

  • How many flights depart from St. Louis to Seattle on average per day?

    Per day, 16 flights depart from St. Louis to Seattle on average.
    Morning (6am - Noon) - 56% of flight departures
    Afternoon (Noon - 6pm) - 19% of flight departures
    Evening (6pm - Midnight) - 25% of flight departures

  • How long is the flight from St. Louis to Seattle?

    Airlines like Spirit Airlines and Frontier fly from St. Louis to Seattle in about 8h 14m. The time it takes to get you to your destination can typically vary by up to 9h 05m. There are 1714 mi between St. Louis and Seattle. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from St. Louis to Seattle round-trip?

    Currently priced at $135, Spirit Airlines will fly you from St. Louis to Seattle and back. In addition to Spirit Airlines, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on Frontier for as low as $166. You may be able to fly from St. Louis to Seattle for 60% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from St. Louis to Seattle one-way?

    The cheapest airlines for a one-way flight from St. Louis to Seattle are Frontier ($109), Delta ($113), and Alaska Airlines ($119).

  • What are the most popular airlines that fly from St. Louis to Seattle?

    Consider Undisclosed Carrier, American Airlines or Alaska Airlines when booking your flight. These represent the most popular airlines when flying from St. Louis to Seattle.

  • What are the most reliable airlines from St. Louis to Seattle?

    The top 3 most reliable airlines when flying from St. Louis to Seattle are Qatar Airways (93%), Japan Airlines (93%) and American Airlines (89%).

  • What are the cheapest flights from St. Louis to Seattle?

    Looking for the cheapest flight from St. Louis to Seattle? While on average our users pay $1,052, our data indicates the cheapest price to be $158. The most popular route (Lambert-St Louis - Seattle/Tacoma Intl), is priced around $139.

  • What does STL to SEA mean?

    STL stands for Lambert-St Louis Airport, while SEA stands for Seattle/Tacoma Intl Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry.

  • Where are the most common layover locations when flying from St. Louis to Seattle?

    St. Louis to Seattle flights have a layover in Salt Lake City most of the time.

  • What are some popular things to do or see while on a layover in Salt Lake City?

    Most Salt Lake City visitors opt to spend their time experiencing Temple Square, Family History Library, and Abravanel Hall. Temple Square, Family History Library, and Abravanel Hall can be accessed by traveling approximately 4.7 mi, 4.7 mi, and 4.7 mi, respectively from Salt Lake City. Travelers in need of a car in Salt Lake City can rent one for about $50 per day.

  • Where are the least popular layover locations for St. Louis to Seattle flights?

    The least popular layover on flights from St. Louis to Seattle is Denver.

  • Can I find deals for flights from St. Louis to Seattle that include extra baggage allowance?

    The amount of baggage you can bring on your St. Louis to Seattle flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from St. Louis to Seattle with specific airlines?

    Yes, Cheapflights allows you to browse and filter St. Louis to Seattle flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from St. Louis to Seattle that include hotel bookings?

    Yes. In addition to deals on St. Louis to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Seattle.

  • Can I find deals for business class flights from St. Louis to Seattle?

    Yes. Cheapflights offers flight deals from St. Louis to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from St. Louis to Seattle that allow pets onboard?

    Many airlines flying from St. Louis to Seattle offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from St. Louis to Seattle?

    Yes, you can often find last-minute deals on St. Louis to Seattle flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the St. Louis to Seattle flight deals updated?

    The St. Louis to Seattle flight deals you see on this page were last updated on 5/14.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Seattle
See prices for flight routes from nearby airports that may be better suited for you.

Kansas City to Seattle flights
Kansas City to Portland flights
Springfield to Seattle flights
St. Louis to Portland flights
Springfield to Portland flights
St. Louis to Spokane flights
Kansas City to Spokane flights
Columbia to Portland flights
Springfield to Spokane flights
St. Louis to Pasco flights
Columbia to Seattle flights
Joplin to Seattle flights
St. Louis to Pullman flights
St. Louis to Yakima flights
Joplin to Portland flights
Columbia to Spokane flights
Kansas City to Pasco flights
Kirksville to Seattle flights
Kansas City to Walla Walla flights
Joplin to Spokane flights
Branson to Seattle flights
Fort Leonard Wood to Portland flights
Quincy to Seattle flights

Top 7 airlines flying from St. Louis to Seattle

Discover the top 7 airlines that operate flights from St. Louis to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,632,958 searches. Data last updated May 14, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$152Average$233FlexibilityNo cancel feeOn-time62%
Search Frontier flights
Spirit AirlinesCheapest$155Average$299FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
DeltaCheapest$156Average$286FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapest$168Average$398FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Sun Country AirCheapest$169Average$384FlexibilityNo cancel feeOn-time83%
Search Sun Country Air flights
United AirlinesCheapest$176Average$333FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapest$176Average$456FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Philadelphia to Denver flights
Chicago to Toronto flights
Minneapolis to Seattle flights
New York to Atlanta flights
Minneapolis to New York flights
New York to Japan flights
Boston to San Diego flights
Sacramento to Dallas flights
San Francisco to Boston flights
Los Angeles to Washington, D.C. flights
Boston to Austin flights
St. Louis to Seoul flights

Search flights from St. Louis to Seattle by cabin class

Find flights from St. Louis to Seattle, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
Business Class
Prem Econ Class
Economy Class

Hourly flight availability from St. Louis to Seattle

Find hourly flight availability from St. Louis to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 14, 2024.
1%of flight departuresEarly morningMidnight to 6 am
58%of flight departuresMorning6 am to noon
41%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from St. Louis to Seattle

Explore weekly flight availability from St. Louis to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated May 14, 2024.
Sunday4daily flights
Monday8daily flights
Tuesday6daily flights
Wednesday4daily flights
Thursday6daily flights
Friday8daily flights
Saturday6daily flights

Book a flight to one of these trending destinations

User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations
Flights to Montes Claros
Flights to Girona Costa Brava
Flights to Naxos
Flights to Bourgas
Flights to Hyannis Barnstable
Flights to Samos
Flights to Reggio Calabria Tito Menniti
Flights to Devils Lake
Flights to Ningbo Lishe Intl
Flights to Pellston Emmet County
Flights to Provincetown
Flights to Cortez Montezuma County
Flights to Ohrid
Flights to Oran Es Senia
Flights to Menorca/Mahon
Flights to Hakodate
Flights to Ordu/Giresun
Flights to Laayoune Hassan I
Flights to Cornwall Newquay
Flights to Melilla
Flights to Rennes St Jacques
Flights to Parikia Paros
Flights to Constanţa Mihail Kogalniceanu
Flights to Miyakojima Hirara

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from St. Louis to Seattle?

Deals for St. Louis to Seattle flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Seattle?

Cheapflights helps you find that perfect flight to Seattle from St. Louis by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from St. Louis to Seattle with no change fees?

Certainly. Search results for flights to Seattle from St. Louis shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from St. Louis to Seattle become cheaper?

Of course! You can now track prices for flights from St. Louis to Seattle and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
View all available airlines