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 1/15. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — STL
Nov 25 — Dec 21
Mon 11/25
Mon 12/2
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 Wednesday or Saturday 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 November 20, 2024.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Popular in

June

Cheapest in

January

Round-trip from

$236
(Alaska Airlines)

One-way from

$109
(Alaska Airlines)
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
High demand for flights, 19% potential price rise
Search Deals
Best time to find cheap flights, 34% potential price drop
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

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 November 20, 2024.

This CheapOair deal was found by Cheapflights users on 11/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/132:34 pmSEA - STL
1 stop15h 39mFrontier
Mon 12/166:46 pmSTL - SEA
1 stop20h 24mFrontier
Deal found 11/19$238
This Delta deal was found by Cheapflights users on 11/19. 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.
Fri 12/612:55 amSEA - STL
1 stop7h 45mDelta
Sat 12/75:15 pmSTL - SEA
1 stop7h 56mDelta
Deal found 11/19$246
This Alaska Airlines deal was found by Cheapflights users on 11/19. 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.
Fri 12/136:06 pmSEA - STL
Nonstop3h 53mAlaska Airlines
Sun 12/157:00 amSTL - SEA
Nonstop4h 34mAlaska Airlines
Deal found 11/19$262
This American Airlines deal was found by Cheapflights users on 11/20. 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.
Sun 12/812:15 amSEA - STL
1 stop7h 31mAmerican Airlines
Thu 12/129:39 amSTL - SEA
1 stop7h 34mAmerican Airlines
Deal found 11/20$267
This United deal was found by Cheapflights users on 11/20. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/115:10 pmSEA - STL
2 stops15h 17mUnited Airlines
Sat 12/1411:05 amSTL - SEA
1 stop10h 15mUnited Airlines
Deal found 11/20$311
This Southwest deal was found by Cheapflights users on 11/19. 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.
Sat 12/147:00 amSEA - STL
2 stops11h 05mSouthwest
Tue 12/174:20 pmSTL - SEA
1 stop7h 25mSouthwest
Deal found 11/19$322
This Mytrip deal was found by Cheapflights users on 11/19. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/135:15 amSEA - STL
3 stops32h 06mMultiple Airlines
Mon 12/1612:00 pmSTL - SEA
3 stops31h 02mMultiple Airlines
Deal found 11/19$393

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 2,629,791 searches. Data last updated November 20, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 2/28

6:11 pm-11:59 pm

Nonstop3h 48m

Lambert-St Louis

Tue 3/4

7:00 am-9:35 am

Nonstop4h 35m

$236

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 12/13

2:34 pm-8:13 am

1 stop15h 39m

Lambert-St Louis

Mon 12/16

6:46 pm-1:10 pm

1 stop20h 24m

$238

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 1/21

11:17 pm-10:47 am

1 stop9h 30m

Lambert-St Louis

Mon 2/17

4:39 pm-10:45 pm

1 stop8h 06m

$245

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 12/6

12:55 am-10:40 am

1 stop7h 45m

Lambert-St Louis

Sat 12/7

5:15 pm-11:11 pm

1 stop7h 56m

$246

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 1/17

1:43 pm-11:46 pm

1 stop8h 03m

Lambert-St Louis

Mon 1/20

1:40 pm-9:21 pm

1 stop9h 41m

$261

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sat 12/14

7:00 am-8:05 pm

2 stops11h 05m

Lambert-St Louis

Tue 12/17

4:20 pm-9:45 pm

1 stop7h 25m

$322

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 12/13

5:15 am-3:21 pm

3 stops32h 06m

Lambert-St Louis

Mon 12/16

12:00 pm-5:02 pm

3 stops31h 02m

$393

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 1/15

8:00 am-1:53 pm

Nonstop3h 53m

$109

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sat 1/18

3:34 pm-11:14 pm

1 stop5h 40m

$118

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 12/24

9:36 pm-8:13 am

1 stop8h 37m

$123

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/19

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 November.
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*1 star
FareScanPrice Accuracy3 starsTrust Score*1 star
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy2 starsTrust Score*3 stars
FlightsMojoPrice 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.

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 November 15, 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, September is the cheapest month in which you can book a flight from Seattle to St. Louis (average of $308). Flying from Seattle to St. Louis in March is currently the most expensive (average of $357). 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 November 20, 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 November 18, 2024.

Travelers seeking maximum savings on their Seattle to St. Louis flight should consider departing on Friday 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 November 20, 2024.
Get a feel of what it's like to fly with Alaska Airlines, United Airlines and American Airlines 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
5,014 reviews

Overall

8.1

Entertainment

7.7

Comfort

8.1

Crew

8.7

Boarding

8.2

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Southwest
8.1
Very good
5,014 reviews
Southwest
8.1
Very good
5,014 reviews

Overall

8.1

Entertainment

7.7

Comfort

8.1

Crew

8.7

Boarding

8.2

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Alaska Airlines
8.0
Very good
9,461 reviews
Southwest
8.1
Very good
5,014 reviews

Overall

8.1

Entertainment

7.7

Comfort

8.1

Crew

8.7

Boarding

8.2

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Delta
8.0
Very good
8,756 reviews
Southwest
8.1
Very good
5,014 reviews

Overall

8.1

Entertainment

7.7

Comfort

8.1

Crew

8.7

Boarding

8.2

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

United Airlines
7.4
Good
9,171 reviews
Southwest
8.1
Very good
5,014 reviews

Overall

8.1

Entertainment

7.7

Comfort

8.1

Crew

8.7

Boarding

8.2

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

WestJet
7.3
Good
2,811 reviews
Southwest
8.1
Very good
5,014 reviews

Overall

8.1

Entertainment

7.7

Comfort

8.1

Crew

8.7

Boarding

8.2

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

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 52m for a nonstop flight. There are 3 flights 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 29 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 $236. Other airlines that can offer you cheap pricing are Frontier, from $238, and United Airlines, from $245. These flights start at 34% 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 Alaska Airlines. You may also be able to find cheap deals on Frontier and Delta, with prices starting from $116 and $118, 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 (87%), Alaska Airlines (86%), Air Tahiti Nui (86%).

  • 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 $345. The most popular route, (Seattle/Tacoma Intl - Lambert-St Louis), can usually be booked for $172.

  • 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, September is the cheapest month in which you can book a flight from Seattle to St. Louis (average of $308). Flying from Seattle to St. Louis in March is currently the most expensive (average of $357). 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
Portland to Springfield flights
Seattle to Branson flights
Spokane to Kansas City flights
Seattle to Joplin flights
Spokane to St. Louis flights
Portland to Joplin flights
Spokane to Springfield flights
Pasco to Kansas City flights
Seattle to Columbia flights
Pasco to St. Louis flights
Bellingham to Kansas City flights
Pullman to Kansas City flights
Walla Walla to St. Louis flights
Pasco to Springfield flights
Pullman to St. Louis flights
Seattle to Quincy flights
Yakima to Springfield flights
Portland to Columbia flights
Portland to Branson flights
Bellingham 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 2,629,791 searches. Data last updated November 20, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$141Average$230FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$157Average$398FlexibilityNo cancel feeOn-time71%
DeltaCheapest$206Average$301FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$215Average$342FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$216Average$404FlexibilityNo 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.
View all available airlines