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St. Louis

$80+ 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 4/16. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — STL
Apr 26 — May 31
Sun 4/26
Sun 5/3
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 March 27, 2026.

This CheapOair deal was found by Cheapflights users on 3/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/1611:48 am
PDX
-
STL
1 stop5h 33m
Frontier
Sat 4/188:17 pm
STL
-
PDX
1 stop16h 03m
Frontier
Deal found 3/26$216
This Southwest deal was found by Cheapflights users on 3/25. 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.
Wed 4/2211:55 pm
PDX
-
STL
1 stop7h 10m
Southwest
Wed 4/295:30 am
STL
-
PDX
2 stops10h 20m
Southwest
Deal found 3/25$218
This CheapOair deal was found by Cheapflights users on 3/23. 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.
Wed 4/2912:38 pm
PDX
-
STL
1 stop28h 43m
Frontier
Sat 5/28:17 pm
STL
-
PDX
1 stop16h 03m
Frontier
Deal found 3/23$221
This Delta deal was found by Cheapflights users on 3/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2111:15 pm
PDX
-
STL
1 stop8h 27m
Delta
Sat 5/25:00 pm
STL
-
PDX
1 stop7h 45m
Delta
Deal found 3/26$224
This Southwest deal was found by Cheapflights users on 3/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2011:55 pm
PDX
-
STL
1 stop7h 35m
Southwest
Tue 4/281:45 pm
STL
-
PDX
2 stops9h 00m
Southwest
Deal found 3/26$225
This Southwest deal was found by Cheapflights users on 3/25. 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.
Mon 5/112:50 pm
PDX
-
STL
1 stop7h 00m
Southwest
Tue 5/125:30 am
STL
-
PDX
2 stops10h 20m
Southwest
Deal found 3/25$230
This CheapOair deal was found by Cheapflights users on 3/23. 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.
Mon 4/2011:48 am
PDX
-
STL
1 stop5h 44m
Frontier
Mon 4/278:17 pm
STL
-
PDX
1 stop17h 35m
Frontier
Deal found 3/23$236
This United Airlines deal was found by Cheapflights users on 3/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/187:45 pm
PDX
-
STL
1 stop8h 02m
United Airlines
Wed 5/275:41 pm
STL
-
PDX
1 stop6h 49m
United Airlines
Deal found 3/26$237
This Kiwi.com deal was found by Cheapflights users on 3/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2212:38 pm
PDX
-
STL
2 stops19h 52m
Frontier
Sat 5/28:17 pm
STL
-
PDX
1 stop16h 03m
Frontier
Deal found 3/26$243
This American Airlines deal was found by Cheapflights users on 3/25. 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.
Fri 5/13:16 pm
PDX
-
STL
1 stop6h 30m
American Airlines
Tue 5/55:21 pm
STL
-
PDX
1 stop8h 36m
American Airlines
Deal found 3/25$244
This Delta deal was found by Cheapflights users on 3/25. 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 4/145:45 am
PDX
-
STL
1 stop5h 38m
Delta
Tue 4/146:45 pm
STL
-
PDX
1 stop7h 08m
Delta
Deal found 3/25$245
This Delta deal was found by Cheapflights users on 3/24. 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 5/209:30 am
SEA
-
STL
1 stop9h 39m
Delta
Tue 5/267:59 pm
STL
-
SEA
1 stop6h 13m
Delta
Deal found 3/24$268

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 March 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$216
(CheapOair)

One-way from

$80
(Priceline)

Popular in

December

Cheapest in

January

Average price

$431

Good round-trip deal

$318 or less

Good one-way deal

$223 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 ($18 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 27, 2026.
Use the filters below to find and compare flights from Washington to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Tue 4/14

11:59 pm-8:25 am

1 stop6h 26m

Lambert-St Louis

Fri 4/17

6:05 pm-10:54 pm

1 stop6h 49m

$264

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 6/11

5:30 am-2:10 pm

1 stop6h 40m

Lambert-St Louis

Tue 6/16

5:55 pm-12:20 am

1 stop8h 25m

$274

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 4/22

6:50 am-6:05 pm

2 stops9h 15m

Lambert-St Louis

Wed 4/29

5:30 am-6:00 pm

2 stops14h 30m

$275

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Sat 5/2

2:41 pm-10:45 pm

1 stop6h 04m

Lambert-St Louis

Tue 5/5

4:44 pm-10:59 pm

1 stop8h 15m

$277

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sat 4/11

7:56 pm-9:48 am

2 stops35h 52m

Lambert-St Louis

Sat 4/25

8:17 pm-9:27 am

1 stop15h 10m

$282

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Mon 4/13

11:55 pm-9:30 am

1 stop7h 35m

Lambert-St Louis

Fri 4/17

1:55 pm-9:40 pm

2 stops9h 45m

$295

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 5/21

3:10 pm-11:21 pm

1 stop6h 11m

Lambert-St Louis

Wed 5/27

7:59 pm-11:44 pm

1 stop5h 45m

$309
Quickest round-trip

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 5/20

10:37 am-4:37 pm

Nonstop4h 00m

Lambert-St Louis

Wed 5/27

5:33 pm-7:50 pm

Nonstop4h 17m

$309

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sat 4/25

5:45 am-6:10 pm

2 stops10h 25m

Lambert-St Louis

Sat 5/2

2:05 pm-10:10 pm

2 stops10h 05m

$309

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 6/3

11:15 am-9:45 pm

2 stops8h 30m

Lambert-St Louis

Wed 6/10

5:55 pm-11:30 pm

1 stop7h 35m

$311

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 60 resultsSorted by cheapest first
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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, January is the cheapest month in which you can book a flight from State of Washington to St. Louis (average of $152). 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 March 27, 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.

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 March 27, 2026.

The most flights from USWA to STL are scheduled on a Wednesday (11 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (2 on average).

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 6h 26m. United Airlines provides one of the quickest options available for as low as $264. 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 American Airlines from $88 and Southwest 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 Air Tahiti Nui (96%), Alaska Airlines (96%) and Hawaiian Airlines (96%).

  • 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 $382. The most popular route, (Seattle/Tacoma Intl - Lambert-St Louis), can usually be booked for $169.

  • 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, January is the cheapest month in which you can book a flight from State of Washington to St. Louis (average of $152). 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
Fenton
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
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 March 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$94Average$353FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$136Average$210FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$157Average$361FlexibilityNo cancel feeOn-time69%
Hawaiian AirlinesCheapest$181Average$385FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$182Average$378FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$188Average$430FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$225Average$428FlexibilityNo cancel feeOn-time75%

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