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

The Seattle/Tacoma Intl to Lambert-St Louis flight path was viewed by 5 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

Cheapflights users have booked flights from Seattle to St. Louis round-trip from $220. Other airlines that can offer you cheap pricing are Delta, from $224, and American Airlines, from $233. These flights start at 42% lower than the current average price 3 months from now.

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

$95 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on Frontier and Southwest, with prices starting from $96 and $105, respectively.

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

The cheapest flight price from Seattle to St. Louis is $118. On average you can expect to pay $545. The most popular route, (Seattle/Tacoma Intl - Lambert-St Louis), can usually be booked for $184.

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

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Seattle to St. Louis on time: American Airlines (93%), Alaska Airlines (93%), Hawaiian Airlines (93%).

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

American Airlines, Alaska Airlines and Delta are the most popular airlines when flying from Seattle to St. Louis.

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

Flying to your destination on a Saturday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to St. Louis. Check prices with Cheapflights to find a great deal for your trip.

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

To save on the cost of your flight from Seattle to St. Louis, book at least 48 days before your planned departure. Booking around this time can save you about 73% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $418 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $418.

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

September can be a great time to fly to St. Louis from Seattle with a flight ticket averaging about $386. Cheapflights users have found deals in the month of September for as cheap as $216. The most expensive prices can be found in the month of December.

Most accurate provider : When it comes to deals on Seattle-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-St. Louis flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Seattle-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

If you book a flight from Seattle to St. Louis, you will be flying from Seattle/Tacoma Intl to Lambert-St Louis. Flights to Lambert-St Louis (STL) from Seattle/Tacoma Intl (SEA) take 3h 50m for a nonstop flight. There are 7 flights from Seattle/Tacoma Intl to St. Louis per day from 7 airlines.

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

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

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

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

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

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

$95+ Flights from Seattle to St. Louis

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Find cheap flights from Seattle to St. Louis with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Lambert-St Louis are usually found in September or April, booked 86 days in advance, depart on a Thursday or Friday and return on a Wednesday

Cheap flight deals from Seattle to St. Louis

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$220 (FlightHub)
One-way from	$95 (Delta)
Popular in	December
Cheapest in	September
Average price	$337
Good round-trip deal	$340 or less
Good one-way deal	$144 or less

Provider with most accurate pricing for Seattle/Tacoma Intl-Lambert-St Louis flight deals.

Search Deals

Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Lambert-St Louis flights.

Search Deals

From Seattle/Tacoma Intl to Lambert-St Louis

Search Deals

One-way flight from Seattle/Tacoma Intl to Lambert-St Louis

Search Deals

Highest demand for flights based on searches. 7% potential increase in price ($30 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 2025

Search Deals

Price to beat on a round-trip flight from Seattle/Tacoma Intl to Lambert-St Louis.

Search Deals

Price to beat on a one-way flight from Seattle/Tacoma Intl to Lambert-St Louis.

Search Deals

Find flight deals from Seattle to St. Louis

Cheapest flights from Seattle to St. Louis
Explore the most affordable flight options available from Seattle to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 11, 2025.

Fri 4/256:00 amSEA - STL

1 stop26h 01mFrontier

Sun 4/279:55 pmSTL - SEA

1 stop22h 07mFrontier

Deal found 4/10

$220

Thu 6/1211:59 pmSEA - STL

1 stop6h 40mDelta

Tue 7/17:15 pmSTL - SEA

1 stop6h 49mDelta

Deal found 4/9

$224

Tue 5/206:04 pmSEA - STL

Nonstop4h 00mMultiple Airlines

Sat 5/247:55 pmSTL - SEA

1 stop6h 42mMultiple Airlines

Deal found 4/10

$233

Mon 7/1410:40 pmSEA - STL

1 stop9h 20mSouthwest

Mon 7/217:15 pmSTL - SEA

1 stop8h 10mSouthwest

Deal found 4/9

$234

Thu 9/256:03 pmSEA - STL

Nonstop3h 56mHawaiian Airlines

Sun 9/287:36 pmSTL - SEA

Nonstop4h 24mHawaiian Airlines

Deal found 4/10

$249

Tue 5/206:04 pmSEA - STL

Nonstop4h 00mAlaska Airlines

Wed 5/286:22 pmSTL - SEA

Nonstop4h 28mAlaska Airlines

Deal found 4/10

$257

Fri 5/307:00 amSEA - STL

1 stop6h 30mUnited Airlines

Mon 6/27:10 pmSTL - SEA

1 stop7h 49mUnited Airlines

Deal found 4/10

$262

Thu 8/710:46 amSEA - STL

1 stop7h 37mAmerican Airlines

Sun 8/176:10 pmSTL - SEA

1 stop6h 52mAmerican Airlines

Deal found 4/10

$284

Best flights from Seattle to St. Louis
Discover carefully curated flight deals from Seattle to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 11, 2025.

Fri 4/256:00 amSEA - STL

1 stop26h 01mFrontier

Sun 4/279:55 pmSTL - SEA

1 stop22h 07mFrontier

Deal found 4/10

$220

Thu 6/1211:59 pmSEA - STL

1 stop6h 40mDelta

Mon 6/307:15 pmSTL - SEA

1 stop6h 48mDelta

Deal found 4/9

$224

Thu 5/112:59 amSEA - STL

1 stop7h 34mAmerican Airlines

Mon 5/57:19 pmSTL - SEA

1 stop7h 26mAmerican Airlines

Deal found 4/11

$233

Sat 5/176:04 pmSEA - STL

Nonstop4h 00mMultiple Airlines

Mon 5/196:53 pmSTL - SEA

1 stop7h 51mMultiple Airlines

Deal found 4/10

$243

Fri 5/26:03 pmSEA - STL

Nonstop3h 56mAlaska Airlines

Mon 5/56:30 amSTL - SEA

Nonstop4h 24mAlaska Airlines

Deal found 4/11

$249

Sun 5/116:03 pmSEA - STL

Nonstop3h 56mHawaiian Airlines

Wed 5/146:30 amSTL - SEA

Nonstop4h 24mHawaiian Airlines

Deal found 4/10

$277

Wed 5/147:10 amSEA - STL

1 stop8h 45mSouthwest

Wed 5/213:00 pmSTL - SEA

2 stops9h 20mSouthwest

Deal found 4/10

$298

Fri 5/211:59 pmSEA - STL

1 stop9h 04mUnited Airlines

Mon 5/53:43 pmSTL - SEA

2 stops9h 20mUnited Airlines

Deal found 4/11

$312

Last-minute flights from Seattle to St. Louis
Discover last-minute flight deals from Seattle to St. Louis. Data last updated April 11, 2025 and is based on user searches.

Wed 4/168:04 amSEA - STL

Nonstop4h 11mMultiple Airlines

Wed 4/236:58 pmSTL - SEA

1 stop7h 46mMultiple Airlines

Deal found 4/10

$393

Wed 4/168:04 amSEA - STL

Nonstop4h 11mHawaiian Airlines

Wed 4/236:30 amSTL - SEA

Nonstop4h 24mHawaiian Airlines

Deal found 4/10

$582

Thu 4/1712:59 amSEA - STL

1 stop7h 34mAmerican Airlines

Tue 4/299:41 amSTL - SEA

1 stop7h 56mAmerican Airlines

Deal found 4/10

$358

Thu 4/176:04 pmSEA - STL

Nonstop3h 55mAlaska Airlines

Sun 4/203:11 pmSTL - SEA

Nonstop4h 34mAlaska Airlines

Deal found 4/10

$497

Fri 4/185:35 amSEA - STL

2 stops8h 15mSouthwest

Tue 4/295:25 pmSTL - SEA

1 stop8h 25mSouthwest

Deal found 4/10

$408

Fri 4/189:10 amSEA - STL

2 stops10h 40mUnited Airlines

Tue 4/291:43 pmSTL - SEA

2 stops13h 15mUnited Airlines

Deal found 4/10

$458

Sun 4/2012:45 amSEA - STL

1 stop7h 45mDelta

Fri 4/257:15 pmSTL - SEA

1 stop6h 47mDelta

Deal found 4/10

$369

Fri 4/256:00 amSEA - STL

1 stop26h 01mFrontier

Sun 4/279:55 pmSTL - SEA

1 stop22h 07mFrontier

Deal found 4/10

$220

Thu 5/112:59 amSEA - STL

1 stop7h 34mAmerican Airlines

Mon 5/57:19 pmSTL - SEA

1 stop7h 26mAmerican Airlines

Deal found 4/10

$224

Fri 5/26:03 pmSEA - STL

Nonstop3h 56mHawaiian Airlines

Mon 5/56:30 amSTL - SEA

Nonstop4h 24mHawaiian Airlines

Deal found 4/10

$249

Wed 5/147:10 amSEA - STL

1 stop8h 45mSouthwest

Wed 5/213:00 pmSTL - SEA

2 stops9h 20mSouthwest

Deal found 4/10

$298

Tue 5/206:04 pmSEA - STL

Nonstop4h 00mMultiple Airlines

Sat 5/247:55 pmSTL - SEA

1 stop6h 42mMultiple Airlines

Deal found 4/10

$233

One-way flights from Seattle to St. Louis
Search for one-way flight options from Seattle to St. Louis. Find affordable one-way fares based on user searches. Data last updated April 11, 2025.

Mon 6/26:00 amSEA - STL

1 stop8h 47mDelta

Deal found 4/11

$95

Tue 4/226:00 amSEA - STL

1 stop26h 01mFrontier

Deal found 4/10

$96

Tue 5/135:00 amSEA - STL

2 stops10h 45mSouthwest

Deal found 4/10

$105

Fri 5/2311:59 pmSEA - STL

1 stop8h 13mUnited Airlines

Deal found 4/10

$109

Tue 5/278:11 amSEA - STL

Nonstop3h 56mHawaiian Airlines

Deal found 4/11

$119

Fri 4/2512:59 amSEA - STL

1 stop7h 26mAmerican Airlines

Deal found 4/10

$124

Mon 6/26:04 pmSEA - STL

Nonstop4h 00mAlaska Airlines

Deal found 4/10

$139

Fri 5/96:00 amSEA - STL

2 stops25h 15mSpirit Airlines

Deal found 4/9

$145

Sat 7/1211:59 pmSEA - STL

1 stop17h 32mSun Country Air

Deal found 4/10

$178

Tue 5/203:20 pmSEA - STL

3 stops42h 25mMultiple Airlines

Deal found 4/10

$195

Cheapflights Fare Finder

Use the filters below to find and compare flights from Seattle to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 4/25

6:00 am-10:01 am

1 stop26h 01m

Lambert-St Louis

Sun 4/27

9:55 pm-6:02 pm

1 stop22h 07m

$220

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 6/12

11:59 pm-8:39 am

1 stop6h 40m

Lambert-St Louis

Tue 7/1

7:15 pm-12:04 am

1 stop6h 49m

$224

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 5/20

6:04 pm-12:04 am

Nonstop4h 00m

Lambert-St Louis

Sat 5/24

7:55 pm-12:37 am

1 stop6h 42m

$233

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Mon 7/14

10:40 pm-10:00 am

1 stop9h 20m

Lambert-St Louis

Mon 7/21

7:15 pm-1:25 am

1 stop8h 10m

$234

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 9/25

6:03 pm-11:59 pm

Nonstop3h 56m

Lambert-St Louis

Sun 9/28

7:36 pm-10:00 pm

Nonstop4h 24m

$249

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 5/20

6:04 pm-12:04 am

Nonstop4h 00m

Lambert-St Louis

Wed 5/28

6:22 pm-8:50 pm

Nonstop4h 28m

$257

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 5/30

7:00 am-3:30 pm

1 stop6h 30m

Lambert-St Louis

Mon 6/2

7:10 pm-12:59 am

1 stop7h 49m

$262

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 8/7

10:46 am-8:23 pm

1 stop7h 37m

Lambert-St Louis

Sun 8/17

6:10 pm-11:02 pm

1 stop6h 52m

$284

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Mon 6/2

6:00 am-4:47 pm

1 stop8h 47m

$95

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 4/22

6:00 am-10:01 am

1 stop26h 01m

$96

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/10

Showing 1-10 of 18 results

Compare providers for flights from Seattle to St. Louis

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to St. Louis in April.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
CheapTicketsDeal	Price Accuracy3 stars	Trust Score*3 stars
Priceline	Price Accuracy1 star	Trust Score*3 stars
Cheapflightsfares	Price Accuracy3 stars	Trust Score*2 stars
FareScan	Price Accuracy-	Trust Score*3 stars
Justfly.com	Price Accuracy3 stars	Trust Score*3 stars
JustAirTicket	Price Accuracy-	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Seattle-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-St. Louis flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Seattle-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Seattle with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to St. Louis

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

The best time to book flights from Seattle to St. Louis is 86 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.

What is the cheapest month to book a flight from Seattle to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Seattle to St. Louis (average of $311). Flying from Seattle to St. Louis in March is currently the most expensive (average of $356). 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.

What is the cheapest time of day to fly from SEA to STL?

When flying from Seattle to St. Louis, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 40% versus a flight in the morning.

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

Travelers seeking maximum savings on their Seattle to St. Louis flight should consider departing on Tuesday evenings when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Seattle to St. Louis

The most flights from SEA to STL are scheduled on a Thursday (12 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).

Rainfall in St. Louis by month

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing St. Louis

Get a feel of what it's like to fly with Alaska Airlines, Southwest and Delta from Seattle to St. Louis by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

9,851 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Alaska Airlines

8.0

Very good

9,851 reviews

Alaska Airlines

8.0

Very good

9,851 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Southwest

8.0

Very good

4,279 reviews

Alaska Airlines

8.0

Very good

9,851 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Delta

8.0

Very good

7,910 reviews

Alaska Airlines

8.0

Very good

9,851 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Hawaiian Airlines

7.9

Good

2,366 reviews

Alaska Airlines

8.0

Very good

9,851 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

United Airlines

7.4

Good

8,636 reviews

Alaska Airlines

8.0

Very good

9,851 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Related info for your journey

What airports do I use to fly from Seattle to St. Louis?
If you book a flight from Seattle to St. Louis, you will be flying from Seattle/Tacoma Intl to Lambert-St Louis. Flights to Lambert-St Louis (STL) from Seattle/Tacoma Intl (SEA) take 3h 50m for a nonstop flight. There are 7 flights from Seattle/Tacoma Intl to St. Louis per day from 7 airlines.
How popular is this Seattle to St. Louis flight route?
The Seattle/Tacoma Intl to Lambert-St Louis flight path was viewed by 5 users in the past month. Keep an eye out for changes in search interest prior to high and low season.
What are the cheapest airlines flying from Seattle to St. Louis round-trip?
Cheapflights users have booked flights from Seattle to St. Louis round-trip from $220. Other airlines that can offer you cheap pricing are Delta, from $224, and American Airlines, from $233. These flights start at 42% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from Seattle to St. Louis one-way?
$95 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on Frontier and Southwest, with prices starting from $96 and $105, respectively.
What are the most reliable airlines from Seattle to St. Louis?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Seattle to St. Louis on time: American Airlines (93%), Alaska Airlines (93%), Hawaiian Airlines (93%).
What are the cheapest flights from Seattle to St. Louis?
The cheapest flight price from Seattle to St. Louis is $118. On average you can expect to pay $545. The most popular route, (Seattle/Tacoma Intl - Lambert-St Louis), can usually be booked for $184.
Can I find deals for flights from Seattle to St. Louis that include hotel bookings?
Yes. In addition to deals on Seattle to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Seattle to St. Louis?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to St. Louis.
Can I find deals for business class flights from Seattle to St. Louis?
Yes. Cheapflights offers flight deals from Seattle to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Seattle to St. Louis?
Currently, August is the cheapest month in which you can book a flight from Seattle to St. Louis (average of $311). Flying from Seattle to St. Louis in March is currently the most expensive (average of $356). 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.

See more FAQs

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Alternative routes for Seattle to St. Louis

Complete your trip

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Other flights to St. Louis

Top 7 airlines flying from Seattle to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$141	Average$244	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$188	Average$295	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$196	Average$466	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$216	Average$352	FlexibilityNo cancel fee	On-time69%
Alaska Airlines	Cheapest$236	Average$417	FlexibilityNo cancel fee	On-time75%
Hawaiian Airlines	Cheapest$237	Average$398	FlexibilityNo cancel fee	On-time85%
Southwest	Cheapest$276	Average$528	FlexibilityNo cancel fee	On-time63%

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$95+ Cheap flights from Seattle to St. Louis (SEA - STL)

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 6/2. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Seattle to St. Louis with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Lambert-St Louis are usually found in September or April, booked 86 days in advance, depart on a Thursday or Friday and return on a Wednesday

Cheap flight deals from Seattle to St. Louis

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Seattle to St. Louis

Cheapest flights from Seattle to St. LouisExplore the most affordable flight options available from Seattle to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 11, 2025.

Explore the most affordable flight options available from Seattle to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 11, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Seattle to St. Louis that are best for you.

Compare providers for flights from Seattle to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to St. Louis in April.

Best time to book a flight from Seattle to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Seattle with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Seattle to St. Louis

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

Use this chart to determine the optimal time to book a round-trip flight from Seattle to St. Louis. Price data was last updated on April 4, 2025.

What is the cheapest month to book a flight from Seattle to St. Louis?

What is the cheapest time of day to fly from SEA to STL?

Find hourly flight availability from Seattle to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 11, 2025.

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

Use this chart to determine the cheapest time to fly round-trip from Seattle to St. Louis. Price data was last updated on March 30, 2025.

Weekly flight availability from Seattle to St. Louis

Explore weekly flight availability from Seattle to St. Louis. 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 April 11, 2025.

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

Reviews of airlines servicing St. Louis

Get a feel of what it's like to fly with Alaska Airlines, Southwest and Delta from Seattle to St. Louis by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Seattle to St. Louis. 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 Seattle to St. Louis?

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

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

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

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

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

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

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

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

What is the cheapest month to book a flight from Seattle to St. Louis?

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Alternative routes for Seattle to St. Louis

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Top 7 airlines flying from Seattle to St. Louis

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Cheapest flights from Seattle to St. Louis
Explore the most affordable flight options available from Seattle to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 11, 2025.