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St. Louis

$60+ 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 3/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — STL
feb. 28 — mar. 71
sáb. 2/28
sáb. 3/7
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 enero 29, 2026.

This American Airlines deal was found by Cheapflights users on 1/26. 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.
mar. 2/2412:07 am
SEA
-
STL
1 stop7h 56m
American Airlines
sáb. 2/286:36 pm
STL
-
SEA
1 stop7h 48m
American Airlines
Deal found 1/26$159
This Delta deal was found by Cheapflights users on 1/27. 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.
mié. 4/85:30 am
SEA
-
STL
1 stop5h 47m
Delta
mié. 4/222:20 pm
STL
-
SEA
1 stop6h 10m
Delta
Deal found 1/27$177
This Delta deal was found by Cheapflights users on 1/27. 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.
mié. 3/251:32 pm
SEA
-
STL
1 stop8h 49m
Delta
lun. 3/306:12 pm
STL
-
SEA
1 stop7h 51m
Delta
Deal found 1/27$185
This Delta deal was found by Cheapflights users on 1/27. 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.
lun. 2/2311:15 pm
SEA
-
STL
1 stop8h 17m
Delta
vie. 2/276:40 pm
STL
-
SEA
1 stop7h 29m
Delta
Deal found 1/27$193
This CheapOair deal was found by Cheapflights users on 1/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 2/217:55 am
SEA
-
STL
Nonstop3h 56m
Alaska Airlines
sáb. 2/282:47 pm
STL
-
SEA
Nonstop4h 39m
Alaska Airlines
Deal found 1/28$197
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
vie. 3/612:24 pm
SEA
-
STL
1 stop19h 25m
Frontier
lun. 3/98:12 pm
STL
-
SEA
2 stops22h 57m
Frontier
Deal found 1/27$202
This CheapOair deal was found by Cheapflights users on 1/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/247:55 am
SEA
-
STL
Nonstop3h 56m
Alaska Airlines
dom. 3/17:00 am
STL
-
SEA
Nonstop4h 42m
Alaska Airlines
Deal found 1/28$207
This Delta deal was found by Cheapflights users on 1/27. 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. 2/246:10 am
SEA
-
STL
1 stop6h 44m
Delta
dom. 3/16:40 pm
STL
-
SEA
1 stop7h 29m
Delta
Deal found 1/27$208
This Delta deal was found by Cheapflights users on 1/27. 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.
lun. 3/3011:15 pm
SEA
-
STL
1 stop8h 31m
Delta
mié. 4/82:12 pm
STL
-
SEA
1 stop6h 18m
Delta
Deal found 1/27$209
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
jue. 2/267:55 am
SEA
-
STL
Nonstop3h 56m
Hawaiian Airlines
jue. 3/57:00 am
STL
-
SEA
Nonstop4h 42m
Hawaiian Airlines
Deal found 1/28$211
This WAYA deal was found by Cheapflights users on 1/26. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 2/257:55 am
SEA
-
STL
Nonstop3h 56m
Multiple Airlines
sáb. 2/282:51 pm
STL
-
SEA
1 stop7h 35m
Multiple Airlines
Deal found 1/26$213
This CheapOair deal was found by Cheapflights users on 1/27. 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.
lun. 2/237:55 am
SEA
-
STL
Nonstop3h 56m
Alaska Airlines
vie. 2/277:00 am
STL
-
SEA
Nonstop4h 42m
Alaska Airlines
Deal found 1/27$217

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 enero 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$159
(American Airlines)

One-way from

$60
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$268

Good round-trip deal

$217 or less

Good one-way deal

$153 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. 4% potential increase in price ($15 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 enero 29, 2026.
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. 3/25

3:30 pm-11:25 pm

1 stop5h 55m

Lambert-St Louis

lun. 3/30

6:12 pm-12:03 am

1 stop7h 51m

$177

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

vie. 3/6

1:38 pm-12:25 am

1 stop8h 47m

Lambert-St Louis

lun. 3/9

6:12 pm-12:01 am

1 stop7h 49m

$193

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

lun. 3/30

6:02 pm-11:59 pm

Nonstop3h 57m

Lambert-St Louis

mié. 4/8

7:00 am-9:35 am

Nonstop4h 35m

$207

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

jue. 2/26

6:07 pm-11:59 pm

Nonstop3h 52m

Lambert-St Louis

sáb. 2/28

2:47 pm-5:26 pm

Nonstop4h 39m

$207

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

lun. 3/30

11:15 pm-9:46 am

1 stop8h 31m

Lambert-St Louis

jue. 4/9

6:12 pm-12:03 am

1 stop7h 51m

$209

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

jue. 3/26

1:32 pm-12:21 am

1 stop8h 49m

Lambert-St Louis

lun. 3/30

6:12 pm-12:03 am

1 stop7h 51m

$209

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

lun. 3/30

6:02 pm-11:59 pm

Nonstop3h 57m

Lambert-St Louis

jue. 4/9

4:20 pm-6:53 pm

Nonstop4h 33m

$217

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

jue. 2/26

4:40 pm-12:25 am

1 stop5h 45m

Lambert-St Louis

jue. 3/5

6:40 pm-12:09 am

1 stop7h 29m

$218

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

mar. 3/17

5:40 am-1:51 pm

1 stop6h 11m

Lambert-St Louis

mié. 3/25

7:00 am-1:53 pm

1 stop8h 53m

$237

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

mar. 3/17

5:40 am-1:51 pm

1 stop6h 11m

Lambert-St Louis

mar. 3/24

3:50 pm-9:24 pm

1 stop7h 34m

$237

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Showing 1-10 of 59 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 December is currently the most expensive (average of $229). 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 enero 29, 2026.

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.

How much does it cost to fly round-trip from State of Washington to St. Louis?

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 57m. Delta provides one of the quickest options available for as low as $207. 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 $84 and Frontier 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 Qatar Airways (89%), Alaska Airlines (88%) and Hawaiian Airlines (85%).

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

    The cheapest flight price from State of Washington to St. Louis is $80. On average you can expect to pay $226. 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 $163). Flying from State of Washington to St. Louis in December is currently the most expensive (average of $229). 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
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
Chesterfield
Alton
Farmington
Festus

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Alternative routes for Washington to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
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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 enero 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$94Average$346FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$121Average$228FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$157Average$381FlexibilityNo cancel feeOn-time69%
Hawaiian AirlinesCheapest$181Average$386FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$182Average$389FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$188Average$488FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$233Average$453FlexibilityNo cancel feeOn-time75%

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