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St. Louis

$63+ 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 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — STL
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Cheap 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 October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$233
(American Airlines)

One-way from

$63
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$345

Good round-trip deal

$323 or less

Good one-way deal

$174 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Lambert-St Louis flights.
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From Washington to Lambert-St Louis
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One-way flight from Washington to Lambert-St Louis
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Highest demand for flights based on searches. 2% potential increase in price ($9 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Price to beat on a round-trip flight from Washington to Lambert-St Louis.
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Price to beat on a one-way flight from Washington to Lambert-St Louis.
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Find 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 October 30, 2025.

This Southwest deal was found by Cheapflights users on 10/29. 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.
Sun 11/236:35 amSEA - STL
1 stop6h 30mSouthwest
Thu 11/276:25 amSTL - SEA
1 stop6h 30mSouthwest
Deal found 10/29$237
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 11/172:22 pmSEA - STL
1 stop16h 45mFrontier
Thu 11/207:57 pmSTL - SEA
1 stop17h 59mFrontier
Deal found 10/28$242
This Delta deal was found by Cheapflights users on 10/29. 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 11/1711:10 pmSEA - STL
1 stop8h 36mDelta
Thu 11/206:34 amSTL - SEA
1 stop8h 22mDelta
Deal found 10/29$243
This Kiwi.com deal was found by Cheapflights users on 10/30. 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.
Fri 11/1411:43 amSEA - STL
1 stop26h 13mFrontier
Sun 11/167:02 pmSTL - SEA
2 stops17h 53mFrontier
Deal found 10/30$246
This Alaska Airlines deal was found by Cheapflights users on 10/30. 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 12/38:34 amSEA - STL
Nonstop3h 53mAlaska Airlines
Sun 12/73:23 pmSTL - SEA
Nonstop4h 36mAlaska Airlines
Deal found 10/30$247
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 11/1312:58 pmSEA - STL
1 stop18h 09mFrontier
Mon 11/179:07 pmSTL - SEA
2 stops17h 00mFrontier
Deal found 10/30$249
This United Airlines deal was found by Cheapflights users on 10/30. 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.
Wed 12/38:30 amPDX - STL
1 stop5h 58mUnited Airlines
Fri 12/125:30 pmSTL - PDX
1 stop7h 22mUnited Airlines
Deal found 10/30$249
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 12/1112:51 pmPDX - STL
1 stop19h 23mFrontier
Tue 12/163:30 pmSTL - PDX
2 stops47h 54mFrontier
Deal found 10/30$251
This Southwest deal was found by Cheapflights users on 10/30. 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.
Tue 12/25:40 amSEA - STL
1 stop11h 15mSouthwest
Thu 12/44:00 pmSTL - SEA
1 stop7h 50mSouthwest
Deal found 10/30$252
This United Airlines deal was found by Cheapflights users on 10/28. 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.
Thu 12/115:00 amPDX - STL
1 stop5h 39mUnited Airlines
Sat 12/131:35 pmSTL - PDX
2 stops11h 17mUnited Airlines
Deal found 10/28$254
This Gotogate deal was found by Cheapflights users on 10/28. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/612:52 pmPDX - STL
1 stop18h 15mFrontier
Thu 11/132:42 pmSTL - PDX
1 stop29h 49mFrontier
Deal found 10/28$255
This Alaska Airlines deal was found by Cheapflights users on 10/30. 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.
Thu 12/46:05 pmSEA - STL
Nonstop3h 54mAlaska Airlines
Sun 12/77:00 amSTL - SEA
Nonstop4h 40mAlaska Airlines
Deal found 10/30$257

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 October 30, 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

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sun 11/23

6:35 am-3:05 pm

1 stop6h 30m

Lambert-St Louis

Thu 11/27

6:25 am-10:55 am

1 stop6h 30m

$237

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 12/3

8:34 am-2:27 pm

Nonstop3h 53m

Lambert-St Louis

Sun 12/7

7:00 am-9:40 am

Nonstop4h 40m

$247

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 11/19

12:35 am-8:55 am

1 stop6h 20m

Lambert-St Louis

Mon 11/24

2:36 pm-10:05 pm

1 stop9h 29m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 12/10

12:32 am-9:10 am

1 stop6h 38m

Lambert-St Louis

Sat 12/13

5:00 pm-10:10 pm

1 stop7h 10m

$249

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 12/4

6:05 pm-11:59 pm

Nonstop3h 54m

Lambert-St Louis

Sun 12/7

7:00 am-9:40 am

Nonstop4h 40m

$257

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 12/3

2:23 pm-1:01 am

2 stops8h 38m

Lambert-St Louis

Sun 12/7

2:20 pm-10:40 pm

2 stops10h 20m

$268

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 11/18

9:15 am-3:18 pm

Nonstop4h 03m

Lambert-St Louis

Thu 11/20

7:00 am-9:33 am

Nonstop4h 33m

$277

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 11/28

10:53 am-7:39 pm

1 stop6h 46m

Lambert-St Louis

Fri 12/5

4:37 pm-12:50 am

2 stops10h 13m

$283

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 11/28

9:27 am-3:19 pm

Nonstop3h 52m

Lambert-St Louis

Fri 12/5

7:00 am-9:40 am

Nonstop4h 40m

$289

BellinghamSt. Louis

BLI - STL

BLISTL

Bellingham

Mon 11/17

12:53 pm-9:07 am

2 stops18h 14m

Lambert-St Louis

Thu 11/20

9:54 pm-7:15 pm

1 stop23h 21m

$291

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/27

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 $163). Flying from State of Washington to St. Louis in March is currently the most expensive (average of $230). 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 October 30, 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 24% on your trip compared to booking a flight in the morning.

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 5 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 53m. Southwest provides one of the quickest options available for as low as $247. There are 1704 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 Southwest from $79 and Delta from $125 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 Finnair (100%), Alaska Airlines (86%) and Hawaiian Airlines (86%).

  • 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 $574. The most popular route, (Seattle/Tacoma Intl - Lambert-St Louis), can usually be booked for $163.

  • 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 $163). Flying from State of Washington to St. Louis in March is currently the most expensive (average of $230). 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
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

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Alternative routes for Washington to St. Louis

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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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$134Average$285FlexibilityNo cancel feeOn-time62%
DeltaCheapest$134Average$373FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$169Average$388FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$186Average$485FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$216Average$384FlexibilityNo cancel feeOn-time69%
Hawaiian AirlinesCheapest$219Average$395FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$246Average$509FlexibilityNo cancel feeOn-time75%

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