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St. Louis

$68+ Cheap flights from Washington to St. Louis (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 1/16. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — STL
Jan 15 — Jan 221
Thu 1/15
Thu 1/22
1 adult, Economy
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Cheap flight deals from Washington to St. Louis

Cheapest flights from Washington to St. Louis
Explore the most affordable flight options available from Washington to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 16, 2025.

This Delta deal was found by Cheapflights users on 12/15. 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.
Wed 12/312:11 pmPDX - STL
1 stop6h 05mDelta
Mon 1/57:00 amSTL - PDX
1 stop7h 32mDelta
Deal found 12/15$249
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 12/3010:55 pmSEA - STL
1 stop8h 29mDelta
Fri 1/236:10 amSTL - SEA
1 stop6h 45mDelta
Deal found 12/16$293
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/302:54 pmSEA - STL
2 stops40h 46mFrontier
Wed 1/213:46 pmSTL - SEA
1 stop21h 33mFrontier
Deal found 12/16$301
This Alaska Airlines deal was found by Cheapflights users on 12/14. 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.
Wed 12/316:05 pmSEA - STL
Nonstop3h 54mAlaska Airlines
Wed 1/72:50 pmSTL - SEA
Nonstop4h 35mAlaska Airlines
Deal found 12/14$312
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/296:33 pmSEA - STL
2 stops13h 07mFrontier
Wed 1/213:46 pmSTL - SEA
1 stop21h 33mFrontier
Deal found 12/16$317
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/251:25 pmSEA - STL
2 stops28h 22mFrontier
Wed 1/213:46 pmSTL - SEA
1 stop21h 33mFrontier
Deal found 12/16$318
This Alaska Airlines deal was found by Cheapflights users on 12/15. 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.
Wed 12/316:05 pmSEA - STL
Nonstop3h 54mAlaska Airlines
Mon 1/55:26 pmSTL - SEA
Nonstop4h 33mAlaska Airlines
Deal found 12/15$322
This Delta deal was found by Cheapflights users on 12/15. 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.
Wed 12/316:00 amSEA - STL
1 stop9h 00mDelta
Mon 1/57:00 amSTL - SEA
2 stops15h 48mDelta
Deal found 12/15$327
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 12/3011:45 amSEA - STL
1 stop8h 31mDelta
Mon 1/196:35 amSTL - SEA
1 stop9h 46mDelta
Deal found 12/16$332
This Alaska Airlines deal was found by Cheapflights users on 12/15. 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.
Mon 12/296:05 pmSEA - STL
Nonstop3h 54mAlaska Airlines
Mon 1/55:26 pmSTL - SEA
Nonstop4h 33mAlaska Airlines
Deal found 12/15$333
This Delta deal was found by Cheapflights users on 12/15. 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.
Mon 12/295:30 amPDX - STL
1 stop5h 53mDelta
Mon 1/57:00 amSTL - PDX
1 stop7h 32mDelta
Deal found 12/15$333
This Delta deal was found by Cheapflights users on 12/15. 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.
Mon 12/296:00 amSEA - STL
1 stop9h 01mDelta
Mon 1/57:00 amSTL - SEA
2 stops13h 23mDelta
Deal found 12/15$338

Find flight deals from Washington to St. Louis

Keep the following information in mind while searching for Washington to St. Louis flight deals. Data was last updated December 16, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$179
(Kiwi.com)

One-way from

$68
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$606

Good round-trip deal

$399 or less

Good one-way deal

$173 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 Washington to Lambert-St Louis
Search Deals
One-way flight from Washington to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($35 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Washington to Lambert-St Louis.
Search Deals
Price to beat on a one-way flight from Washington to Lambert-St Louis.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington 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 16, 2025.
Use the filters below to find and compare flights from Washington to St. Louis that are best for you.

Fly from

Washington

Fly to

St. Louis

Route

Depart

Return

Price

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 5/21

11:25 am-5:13 pm

Nonstop3h 48m

Lambert-St Louis

Wed 5/27

6:20 pm-8:30 pm

Nonstop4h 10m

$229

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 1/14

9:00 am-8:58 pm

2 stops9h 58m

Lambert-St Louis

Sun 1/18

6:30 am-11:32 am

1 stop7h 02m

$237

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Mon 2/2

2:10 pm-10:58 pm

1 stop6h 48m

Lambert-St Louis

Wed 2/4

11:20 am-9:15 pm

2 stops11h 55m

$237

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Mon 1/5

6:05 pm-11:59 pm

Nonstop3h 54m

Lambert-St Louis

Thu 1/8

2:50 pm-5:25 pm

Nonstop4h 35m

$237

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 1/9

1:53 pm-11:25 pm

1 stop7h 32m

Lambert-St Louis

Sun 1/11

6:10 am-12:46 pm

1 stop8h 36m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 1/8

1:39 pm-9:35 pm

1 stop5h 56m

Lambert-St Louis

Sun 1/11

6:10 am-12:46 pm

1 stop8h 36m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Mon 3/16

3:45 pm-11:34 pm

1 stop5h 49m

Lambert-St Louis

Mon 3/23

5:30 am-9:54 am

1 stop6h 24m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 1/1

12:16 pm-10:16 pm

1 stop8h 00m

Lambert-St Louis

Mon 1/5

7:00 am-12:32 pm

1 stop7h 32m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 1/8

1:24 pm-8:58 pm

1 stop5h 34m

Lambert-St Louis

Tue 1/13

4:15 pm-9:12 pm

1 stop6h 57m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 3/4

6:00 am-4:45 pm

1 stop8h 45m

Lambert-St Louis

Mon 3/9

6:04 pm-11:54 pm

1 stop7h 50m

$249

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/14

Showing 1-10 of 60 results
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Best time to book a flight from Washington to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Washington 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 Washington to St. Louis

What is the cheapest month to book a flight from State of Washington to St. Louis?

Currently, July is the cheapest month in which you can book a flight from State of Washington to St. Louis (average of $162). Flying from State of Washington to St. Louis in March is currently the most expensive (average of $232). 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 WA to STL?

Find hourly flight availability from Washington 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 16, 2025.

A simple way to save on the total cost of your ticket is to fly from State of Washington to St. Louis in the evening. If you’re flexible enough to do this you can expect to save up to 26% on your trip compared to booking a flight at noon.

What is the cheapest day to fly from State of Washington to St. Louis?

Use this chart to determine the cheapest time to fly round-trip from Washington to St. Louis. Price data was last updated on December 16, 2024.

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

Related info for your journey

Find useful and relevant information for your journey from Washington 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 airport do you fly into for flights to St. Louis from Washington?

    Lambert-St Louis (STL), located 12.7 mi from the city center, is the airport you fly into when you book flights from Washington to St. Louis.

  • How popular is this State of Washington to St. Louis flight route?

    This flight path from Washington to Lambert-St Louis was viewed by 4 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from State of Washington to St. Louis?

    A quick flight from State of Washington to St. Louis can take about 3h 48m. Alaska Airlines provides one of the quickest options available for as low as $229. There are 1702 mi between State of Washington and St. Louis. This flight may include one or multiple stops.

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

    One-way options have recently been found by users for as low as $74 on United Airlines. Other airlines that offer cheap prices include Frontier from $86 and American Airlines from $88 one-way.

  • What are the most popular routes from State of Washington to St. Louis?

    The most popular flight routes from State of Washington to St. Louis are Seattle/Tacoma Intl - Lambert-St Louis, Portland - Lambert-St Louis and Spokane - Lambert-St Louis.

  • What are the most reliable airlines from State of Washington to St. Louis?

    The top 3 most reliable airlines when flying from State of Washington to St. Louis are Hawaiian Airlines (83%), Air Tahiti Nui (83%) and Qatar Airways (78%).

  • What are the cheapest flights from State of Washington to St. Louis?

    The cheapest flight price from State of Washington to St. Louis is $118. On average you can expect to pay $458. The most popular route, (Seattle/Tacoma Intl - Lambert-St Louis), can usually be booked for $177.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Washington 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 State of Washington to St. Louis?

    Currently, July is the cheapest month in which you can book a flight from State of Washington to St. Louis (average of $162). Flying from State of Washington to St. Louis in March is currently the most expensive (average of $232). 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

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Swansea
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

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Top 7 airlines flying from Washington to St. Louis

Discover the top 7 airlines that operate flights from Washington 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 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$123Average$355FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$136Average$285FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$182Average$391FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$188Average$488FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$216Average$381FlexibilityNo cancel feeOn-time69%
Hawaiian AirlinesCheapest$219Average$395FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$245Average$470FlexibilityNo cancel feeOn-time75%

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