HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
St. Louis

$109+ 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 2/17. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — STL
Dec 23 — Dec 301
Mon 12/23
Mon 12/30
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

The best prices from Seattle/Tacoma Intl to Lambert-St Louis are usually found in January or February, booked 73 days in advance, depart on a Saturday or Tuesday and return on a Friday

Cheap flight deals from Seattle to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to St. Louis (STL). 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 December 18, 2024.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$247
(American Airlines)

One-way from

$109
(CheapOair)

Popular in

December

Cheapest in

January

Average price

$491
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
High demand for flights, 4% potential price rise
Search Deals
Best time to find cheap flights, 3% potential price drop
Search Deals
Average for round-trip flights in December 2024
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 December 18, 2024.

This Alaska Airlines deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/316:04 pmSEA - STL
Nonstop3h 55mAlaska Airlines
Tue 1/72:49 pmSTL - SEA
Nonstop4h 41mAlaska Airlines
Deal found 12/16$277
This Delta deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/316:00 amSEA - STL
1 stop8h 59mDelta
Tue 1/75:00 pmSTL - SEA
1 stop9h 50mDelta
Deal found 12/16$292
This Kissandfly.com deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/319:36 pmSEA - STL
1 stop8h 37mFrontier
Fri 1/39:29 pmSTL - SEA
1 stop22h 43mFrontier
Deal found 12/17$366
This American Airlines deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/3012:31 amSEA - STL
1 stop9h 01mAmerican Airlines
Tue 1/711:38 amSTL - SEA
1 stop10h 26mAmerican Airlines
Deal found 12/16$367
This United Airlines deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3112:32 pmSEA - STL
1 stop9h 56mUnited Airlines
Tue 1/71:45 pmSTL - SEA
2 stops10h 45mUnited Airlines
Deal found 12/16$412
This Trip.com deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/319:36 pmSEA - STL
1 stop8h 37mMultiple Airlines
Fri 1/37:00 amSTL - SEA
Nonstop4h 38mMultiple Airlines
Deal found 12/17$428
This Southwest deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/306:35 amSEA - STL
1 stop11h 15mSouthwest
Sun 1/52:35 pmSTL - SEA
2 stops11h 35mSouthwest
Deal found 12/17$597

Find flights from Seattle to St. Louis within your budget

Customize your flight search to find flights from Seattle to St. Louis 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 2,558,603 searches. Data last updated December 18, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 1/30

12:45 am-10:48 am

1 stop8h 03m

Lambert-St Louis

Fri 2/7

1:40 pm-9:21 pm

1 stop9h 41m

$247

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 1/2

9:36 pm-8:13 am

1 stop8h 37m

Lambert-St Louis

Sat 1/11

6:46 pm-3:41 pm

1 stop22h 55m

$248

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 2/21

8:50 am-4:33 pm

1 stop5h 43m

Lambert-St Louis

Tue 2/25

4:39 pm-12:55 am

2 stops10h 16m

$250

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 1/22

5:50 pm-10:54 am

2 stops15h 04m

Lambert-St Louis

Tue 2/18

10:22 am-4:54 pm

1 stop8h 32m

$256

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 1/23

8:00 am-1:53 pm

Nonstop3h 53m

Lambert-St Louis

Mon 2/17

7:00 am-9:35 am

Nonstop4h 35m

$257

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 1/10

8:00 am-1:53 pm

Nonstop3h 53m

Lambert-St Louis

Sun 1/12

8:34 pm-8:57 am

1 stop14h 23m

$273

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 1/3

9:50 am-8:20 pm

2 stops8h 30m

Lambert-St Louis

Sat 1/11

9:10 am-7:25 pm

2 stops12h 15m

$382

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 1/31

5:45 am-11:14 pm

3 stops15h 29m

Lambert-St Louis

Fri 2/7

5:50 pm-12:53 pm

3 stops21h 03m

$519

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Mon 2/17

11:23 am-5:36 pm

1 stop28h 13m

$109

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 2/5

7:00 am-10:20 pm

2 stops13h 20m

$113

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 15 results
1
2

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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*1 star
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*3 stars
FareScanPrice Accuracy3 starsTrust Score*1 star
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust 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.

Travel insights for flights from Seattle to St. Louis

Get recent, data-driven insights about flights from Seattle to St. Louis including ideal travel times, pricing trends, and more.

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 December 13, 2024.

The best time to book flights from Seattle to St. Louis is 73 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?

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 December 18, 2024.

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 35% versus a flight in the afternoon.

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 December 16, 2024.

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.

Rainfall in St. Louis by month

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

Plan your trip to St. Louis by taking into account the average temperature totals 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 insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated December 18, 2024.
Get a feel of what it's like to fly with United Airlines, American Airlines and Frontier 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.
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Entertainment

7.7

Food

7.2

Boarding

8.2

Comfort

8.1

Overall

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,848 reviews
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Entertainment

7.7

Food

7.2

Boarding

8.2

Comfort

8.1

Overall

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,554 reviews
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Entertainment

7.7

Food

7.2

Boarding

8.2

Comfort

8.1

Overall

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,604 reviews
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Entertainment

7.7

Food

7.2

Boarding

8.2

Comfort

8.1

Overall

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
9,055 reviews
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Entertainment

7.7

Food

7.2

Boarding

8.2

Comfort

8.1

Overall

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Entertainment

7.7

Food

7.2

Boarding

8.2

Comfort

8.1

Overall

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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?

    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 48m for a nonstop flight. There is 1 flight from Seattle/Tacoma Intl to St. Louis per day from 6 airlines.

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

    The Seattle/Tacoma Intl to Lambert-St Louis flight path was viewed by 6 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 $247. Other airlines that can offer you cheap pricing are Frontier, from $248, and United Airlines, from $250. These flights start at 31% lower than the current average price 3 months from now.

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

    $109 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on United Airlines and Delta, with prices starting from $113 and $114, 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 (82%), Alaska Airlines (80%), Air Tahiti Nui (80%).

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

    The cheapest flight price from Seattle to St. Louis is $108. On average you can expect to pay $380. The most popular route, (Seattle/Tacoma Intl - Lambert-St Louis), can usually be booked for $152.

  • 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

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 Seattle to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Kansas City flights
Portland to Kansas City flights
Portland to St. Louis flights
Seattle to Springfield flights
Seattle to Branson flights
Spokane to St. Louis flights
Spokane to Kansas City flights
Portland to Springfield flights
Seattle to Joplin flights
Pasco to St. Louis flights
Spokane to Springfield flights
Pasco to Kansas City flights
Seattle to Columbia flights
Yakima to Springfield flights
Bellingham to Kansas City flights
Portland to Columbia flights
Pasco to Springfield flights
Pullman to Kansas City flights
Portland to Joplin flights
Bellingham to St. Louis flights
Seattle to Quincy flights
Pullman to St. Louis flights
Portland to Branson flights
Walla Walla to St. Louis flights

Top 6 airlines flying from Seattle to St. Louis

Discover the top 6 airlines that operate flights from Seattle to St. Louis. 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 2,558,603 searches. Data last updated December 18, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$141Average$231FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$157Average$390FlexibilityNo cancel feeOn-time71%
DeltaCheapest$206Average$301FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$216Average$346FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$216Average$406FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$375Average$529FlexibilityNo cancel feeOn-time63%
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.