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$62+ Cheap flights from St. Louis (STL) to Washington

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 12/10. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SEA
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from St. Louis to Washington

Keep the following information in mind while searching for St. Louis to Washington flight deals. Data was last updated September 11, 2025.

Round-trip from

$189
(Southwest)

One-way from

$62
(Trip.com)

Popular in

July

Cheapest in

October

Average price

$289

Good round-trip deal

$327 or less

Good one-way deal

$169 or less
From Lambert-St Louis to Washington
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One-way flight from Lambert-St Louis to Washington
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Highest demand for flights based on searches. 14% potential increase in price ($60 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 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 Lambert-St Louis to Washington.
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Price to beat on a one-way flight from Lambert-St Louis to Washington.
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Find flight deals from St. Louis to Washington

Cheapest flights from St. Louis to Washington
Explore the most affordable flight options available from St. Louis to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/145:55 amSTL - GEG
1 stop5h 40mSouthwest
Tue 10/2112:50 pmGEG - STL
1 stop8h 20mSouthwest
Deal found 9/9$189
This Southwest deal was found by Cheapflights users on 9/8. 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 10/223:00 pmSTL - GEG
1 stop9h 25mSouthwest
Wed 11/126:35 amGEG - STL
2 stops8h 45mSouthwest
Deal found 9/8$204
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/83:30 pmSTL - GEG
1 stop6h 16mDelta
Wed 10/154:50 pmGEG - STL
1 stop5h 34mDelta
Deal found 9/10$207
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/76:33 amSTL - SEA
Nonstop4h 32mAlaska Airlines
Sat 10/116:02 pmSEA - STL
Nonstop4h 01mAlaska Airlines
Deal found 9/10$221
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/245:32 pmSTL - SEA
1 stop8h 11mDelta
Tue 9/305:30 amSEA - STL
1 stop6h 03mDelta
Deal found 9/10$222
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.
Wed 10/87:52 pmSTL - SEA
2 stops21h 24mFrontier
Wed 10/158:43 pmSEA - STL
1 stop10h 24mFrontier
Deal found 9/10$223
This Frontier deal was found by Cheapflights users on 9/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/37:55 pmSTL - SEA
1 stop6h 35mFrontier
Sun 10/512:05 pmSEA - STL
2 stops19h 01mFrontier
Deal found 9/8$225
This Orbitz 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/96:33 amSTL - SEA
Nonstop4h 32mMultiple Airlines
Mon 10/138:43 pmSEA - STL
1 stop10h 24mMultiple Airlines
Deal found 9/10$226
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/67:55 pmSTL - SEA
1 stop18h 12mFrontier
Fri 10/108:43 pmSEA - STL
1 stop10h 24mFrontier
Deal found 9/11$227
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.
Tue 9/237:55 pmSTL - PDX
2 stops17h 16mMultiple Airlines
Tue 9/307:15 amPDX - STL
1 stop23h 51mMultiple Airlines
Deal found 9/10$228
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/285:00 amSTL - SEA
1 stop6h 43mUnited Airlines
Wed 10/17:00 amSEA - STL
1 stop6h 44mUnited Airlines
Deal found 9/10$228
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/95:00 amSTL - PDX
1 stop6h 40mUnited Airlines
Thu 10/1611:59 pmPDX - STL
1 stop8h 50mUnited Airlines
Deal found 9/11$229

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Washington 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 September 11, 2025.
Use the filters below to find and compare flights from St. Louis to Washington that are best for you.

Fly from

St. Louis

Fly to

Washington

Route

Depart

Return

Price

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Wed 10/8

3:30 pm-7:46 pm

1 stop6h 16m

Spokane

Wed 10/15

4:50 pm-12:24 am

1 stop5h 34m

$207

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Sat 10/11

6:50 am-12:01 pm

1 stop7h 11m

Spokane

Sat 10/18

5:45 am-3:31 pm

1 stop7h 46m

$207

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Tue 10/21

1:40 pm-5:53 pm

1 stop6h 13m

Seattle/Tacoma Intl

Sat 10/25

5:00 am-3:44 pm

2 stops8h 44m

$222

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Tue 10/14

5:55 am-9:35 am

1 stop5h 40m

Spokane

Tue 10/21

11:50 am-11:10 pm

2 stops9h 20m

$224

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 12/5

7:56 pm-12:05 am

1 stop6h 09m

Portland

Mon 12/8

12:32 am-9:10 am

1 stop6h 38m

$228

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 10/3

4:50 pm-10:45 pm

1 stop7h 55m

Portland

Mon 10/6

11:59 pm-10:49 am

1 stop8h 50m

$229

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 10/18

1:40 pm-8:50 pm

2 stops9h 10m

Portland

Tue 10/21

4:07 pm-11:58 pm

1 stop5h 51m

$231

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Thu 10/23

7:30 pm-11:43 pm

1 stop6h 13m

Spokane

Mon 10/27

4:50 pm-12:24 am

1 stop5h 34m

$233

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Thu 10/9

5:35 pm-11:15 pm

1 stop7h 40m

Spokane

Tue 10/14

5:05 am-12:44 pm

1 stop5h 39m

$233

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Thu 10/23

7:30 pm-11:43 pm

1 stop6h 13m

Spokane

Tue 10/28

2:17 pm-11:06 pm

1 stop6h 49m

$233

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 St. Louis to Washington

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

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

Currently, January is the cheapest month in which you can book a flight from St. Louis to State of Washington (average of $238). Flying from St. Louis to State of Washington in June is currently the most expensive (average of $388). 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 STL to WA?

Find hourly flight availability from St. Louis to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

When flying from St. Louis to State of Washington, 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 St. Louis to State of Washington

Explore weekly flight availability from St. Louis to Washington. 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 September 11, 2025.

The most flights from STL to USWA are scheduled on a Thursday (16 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (7 on average).

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington. Reviews last updated September 11, 2025.
Read through reviews of airlines operating flights from St. Louis to Washington, such as Alaska Airlines, Southwest, and Delta. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Southwest
8.0
Very good
4,248 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Delta
8.0
Very good
7,960 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Hawaiian Airlines
7.8
Good
2,723 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Washington. 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 from for flights from St. Louis to Washington?

    For a flight from St. Louis to Washington, you will be flying from Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city.

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

    The Lambert-St Louis to Washington flight path was viewed by 53 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 St. Louis to State of Washington?

    Delta, United Airlines, and Southwest can get you from St. Louis to State of Washington in just under 5h 40m. Your travel time can differ by up to 36m. St. Louis and State of Washington are separated by a distance of 1488 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    To fly one-way, consider booking your trip with Southwest, which is currently one of the cheapest options available, starting at $62. Delta flights start at $89 while deals on United Airlines start at $117 one-way.

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

    When deciding which route to take from St. Louis to State of Washington consider Lambert-St Louis - Seattle/Tacoma Intl, Lambert-St Louis - Portland or Lambert-St Louis - Spokane as they are the most popular.

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

    The top 3 most reliable airlines when flying from St. Louis to State of Washington are Qatar Airways (93%), Japan Airlines (93%) and Finnair (90%).

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

    Looking for the cheapest flight from St. Louis to State of Washington? While on average our users pay $632, our data indicates the cheapest price to be $124. The most popular route (Lambert-St Louis - Seattle/Tacoma Intl), is priced around $143.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from St. Louis to State of Washington (average of $238). Flying from St. Louis to State of Washington in June is currently the most expensive (average of $388). 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

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Alternative routes for St. Louis to Washington

See prices for flight routes from nearby airports that may be better suited for you.
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Top 7 airlines flying from St. Louis to Washington

Discover the top 7 airlines that operate flights from St. Louis to Washington. 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$94Average$373FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$118Average$219FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$179Average$438FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$188Average$405FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$213Average$515FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$216Average$406FlexibilityNo cancel feeOn-time69%
Hawaiian AirlinesCheapest$239Average$388FlexibilityNo cancel feeOn-time85%

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