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St. Louis

$57+ 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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — STL
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
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 septiembre 11, 2025.

Round-trip from

$171
(Southwest)

One-way from

$57
(Southwest)

Popular in

December

Cheapest in

September

Average price

$302

Good round-trip deal

$311 or less

Good one-way deal

$208 or less
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. 5% potential increase in price ($22 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in September 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 septiembre 11, 2025.

This Southwest deal was found by Cheapflights users on 9/10. 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.
vie. 10/249:35 amSEA - STL
2 stops7h 45mSouthwest
mar. 10/288:45 amSTL - SEA
1 stop9h 40mSouthwest
Deal found 9/10$171
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
mar. 9/307:00 amSEA - STL
1 stop24h 06mFrontier
lun. 10/69:29 pmSTL - SEA
2 stops16h 38mFrontier
Deal found 9/9$172
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
dom. 10/124:11 pmSEA - STL
2 stops14h 56mFrontier
mar. 10/147:52 pmSTL - SEA
1 stop18h 15mFrontier
Deal found 9/9$173
This Southwest deal was found by Cheapflights users on 9/10. 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.
sáb. 11/15:45 amSEA - STL
1 stop9h 15mSouthwest
mar. 11/42:25 pmSTL - SEA
2 stops10h 30mSouthwest
Deal found 9/10$174
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
lun. 11/102:22 pmSEA - STL
1 stop16h 45mFrontier
vie. 11/147:45 pmSTL - SEA
1 stop18h 28mFrontier
Deal found 9/9$175
This Delta deal was found by Cheapflights users on 9/11. 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.
mar. 10/145:00 pmSEA - STL
1 stop5h 24mDelta
jue. 10/237:30 pmSTL - SEA
1 stop6h 29mDelta
Deal found 9/11$177
This Delta deal was found by Cheapflights users on 9/9. 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.
sáb. 11/86:00 amSEA - STL
1 stop7h 31mDelta
mié. 11/125:34 pmSTL - SEA
1 stop8h 25mDelta
Deal found 9/9$178
This Delta deal was found by Cheapflights users on 9/9. 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.
sáb. 11/81:35 pmSEA - STL
1 stop7h 32mDelta
sáb. 11/156:50 amSTL - SEA
1 stop8h 06mDelta
Deal found 9/9$179
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
mié. 10/17:00 amSEA - STL
1 stop24h 06mFrontier
dom. 10/510:39 amSTL - SEA
2 stops27h 02mFrontier
Deal found 9/10$180
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
jue. 10/26:12 amSEA - STL
1 stop24h 54mFrontier
mar. 10/77:52 pmSTL - SEA
2 stops25h 56mFrontier
Deal found 9/10$181
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
sáb. 10/47:00 amSEA - STL
1 stop24h 06mFrontier
sáb. 10/117:52 pmSTL - SEA
1 stop13h 41mFrontier
Deal found 9/10$182
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
jue. 11/1312:58 pmSEA - STL
1 stop18h 09mFrontier
sáb. 11/157:45 pmSTL - SEA
2 stops19h 52mFrontier
Deal found 9/9$183

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 septiembre 11, 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

mié. 10/22

1:20 pm-12:10 am

2 stops8h 50m

Lambert-St Louis

mar. 10/28

3:00 pm-10:55 pm

1 stop9h 55m

$172

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

sáb. 11/1

5:45 am-5:00 pm

1 stop9h 15m

Lambert-St Louis

mar. 11/4

2:25 pm-10:55 pm

2 stops10h 30m

$174

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

jue. 10/2

11:40 pm-8:37 am

1 stop6h 57m

Lambert-St Louis

lun. 10/6

5:31 pm-11:57 pm

1 stop8h 26m

$177

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

sáb. 10/25

6:00 am-3:31 pm

1 stop7h 31m

Lambert-St Louis

sáb. 11/1

5:30 pm-10:22 pm

1 stop6h 52m

$177

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

sáb. 11/15

6:00 am-4:49 pm

1 stop8h 49m

Lambert-St Louis

lun. 11/17

7:47 pm-12:11 am

1 stop6h 24m

$177

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

vie. 11/7

1:30 pm-12:24 am

1 stop8h 54m

Lambert-St Louis

mar. 11/11

6:50 am-12:56 pm

1 stop8h 06m

$177

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

mié. 10/29

12:50 pm-11:10 pm

2 stops8h 20m

Lambert-St Louis

vie. 10/31

3:15 pm-8:30 pm

1 stop7h 15m

$194

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

mié. 9/24

11:10 pm-7:40 am

1 stop6h 30m

Lambert-St Louis

mié. 10/8

5:40 am-11:45 am

1 stop8h 05m

$195

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

mié. 10/1

7:00 am-3:44 pm

1 stop6h 44m

Lambert-St Louis

dom. 10/5

5:00 am-9:43 am

1 stop6h 43m

$202

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

mié. 10/22

12:50 pm-11:10 pm

1 stop8h 20m

Lambert-St Louis

sáb. 10/25

5:35 am-9:10 am

1 stop5h 35m

$202

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

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, August is the cheapest month in which you can book a flight from State of Washington to St. Louis (average of $311). Flying from State of Washington 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 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 septiembre 11, 2025.

When flying from State of Washington to St. Louis, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from State of Washington to St. Louis

Explore weekly flight availability from Washington 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 septiembre 11, 2025.

The most flights from USWA to STL are scheduled on a Thursday (17 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (5 on average).

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 6h 57m. Southwest provides one of the quickest options available for as low as $177. 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 $69 on Southwest. Other airlines that offer cheap prices include Delta from $89 and United Airlines from $117 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 Alaska Airlines (75%), Hawaiian Airlines (75%) and Air Tahiti Nui (69%).

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

    The cheapest flight price from State of Washington to St. Louis is $128. On average you can expect to pay $366. The most popular route, (Seattle/Tacoma Intl - Lambert-St Louis), can usually be booked for $137.

  • 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, August is the cheapest month in which you can book a flight from State of Washington to St. Louis (average of $311). Flying from State of Washington 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

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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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 septiembre 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$137Average$285FlexibilityNo cancel feeOn-time62%
DeltaCheapest$176Average$381FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$186Average$455FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$188Average$424FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$216Average$421FlexibilityNo cancel feeOn-time69%
Hawaiian AirlinesCheapest$219Average$393FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$246Average$515FlexibilityNo cancel feeOn-time75%

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