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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 12/3. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SEA
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
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 October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$123
(Kiwi.com)

One-way from

$62
(Trip.com)

Popular in

July

Cheapest in

October

Average price

$273

Good round-trip deal

$329 or less

Good one-way deal

$218 or less
Provider with most accurate pricing for Lambert-St Louis-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Seattle/Tacoma Intl flights.
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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. 12% potential increase in price ($51 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 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 October 30, 2025.

This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/67:43 pmSTL - PDX
1 stop18h 13mFrontier
Fri 12/1212:55 pmPDX - STL
1 stop19h 19mFrontier
Deal found 10/29$123
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.
Wed 12/37:43 pmSTL - PDX
1 stop18h 13mFrontier
Fri 12/512:55 pmPDX - STL
1 stop19h 19mFrontier
Deal found 10/28$124
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/41:16 pmSTL - PDX
1 stop22h 18mFrontier
Thu 12/1112:51 pmPDX - STL
1 stop19h 23mFrontier
Deal found 10/28$151
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/127:45 pmSTL - GEG
1 stop17h 23mFrontier
Sun 11/1612:03 pmGEG - STL
1 stop19h 04mFrontier
Deal found 10/28$171
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/87:45 pmSTL - PDX
1 stop18h 11mFrontier
Sat 11/1512:52 pmPDX - STL
1 stop18h 15mFrontier
Deal found 10/28$177
This Kiwi.com deal was found by Cheapflights users on 10/27. 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.
Sat 12/207:43 pmSTL - PDX
1 stop18h 00mFrontier
Sun 1/412:47 pmPDX - STL
1 stop19h 15mFrontier
Deal found 10/27$179
This Kiwi.com deal was found by Cheapflights users on 10/27. 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.
Sat 12/207:43 pmSTL - PDX
1 stop18h 00mFrontier
Thu 1/112:47 pmPDX - STL
1 stop19h 15mFrontier
Deal found 10/27$185
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.
Thu 12/183:15 pmSTL - SEA
1 stop11h 20mSouthwest
Mon 12/228:35 pmSEA - STL
1 stop12h 05mSouthwest
Deal found 10/29$188
This Kiwi.com deal was found by Cheapflights users on 10/27. 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.
Mon 12/227:43 pmSTL - PDX
1 stop18h 00mFrontier
Thu 1/112:47 pmPDX - STL
1 stop19h 15mFrontier
Deal found 10/27$190
This Booking.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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/147:45 pmSTL - PDX
1 stop18h 11mFrontier
Mon 11/173:26 pmPDX - STL
1 stop15h 41mFrontier
Deal found 10/28$194
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.
Fri 12/57:43 pmSTL - SEA
1 stop18h 10mFrontier
Mon 12/83:40 pmSEA - STL
2 stops28h 53mFrontier
Deal found 10/28$199
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/167:45 pmSTL - SEA
1 stop18h 28mFrontier
Wed 11/191:37 pmSEA - STL
1 stop27h 21mFrontier
Deal found 10/28$202

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 October 30, 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. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Wed 11/26

5:15 pm-12:35 am

1 stop9h 20m

Seattle/Tacoma Intl

Fri 11/28

5:15 am-3:05 pm

1 stop7h 50m

$227

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Fri 12/5

2:20 pm-10:49 pm

2 stops10h 29m

Spokane

Sun 12/7

1:10 pm-12:48 am

2 stops9h 38m

$236

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Fri 12/5

2:20 pm-10:49 pm

2 stops10h 29m

Spokane

Mon 12/8

7:35 pm-9:10 am

2 stops11h 35m

$236

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Thu 12/4

2:20 pm-10:49 pm

2 stops10h 29m

Spokane

Sun 12/7

1:10 pm-12:48 am

2 stops9h 38m

$236

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Tue 1/27

5:55 am-4:00 pm

2 stops12h 05m

Seattle/Tacoma Intl

Sat 1/31

9:25 am-8:10 pm

2 stops8h 45m

$237

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Fri 1/9

6:35 am-2:21 pm

1 stop9h 46m

Seattle/Tacoma Intl

Sun 1/11

3:35 pm-11:25 pm

1 stop5h 50m

$238

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Wed 12/17

2:25 pm-10:55 pm

2 stops10h 30m

Seattle/Tacoma Intl

Mon 12/22

8:35 pm-8:15 am

1 stop9h 40m

$248

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Mon 1/12

8:45 am-1:45 pm

1 stop7h 00m

Portland

Thu 1/15

8:30 am-4:43 pm

1 stop6h 13m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Tue 12/9

4:37 pm-9:15 pm

1 stop6h 38m

Portland

Thu 12/11

5:00 am-12:39 pm

1 stop5h 39m

$249

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Tue 12/9

2:20 pm-6:14 pm

1 stop5h 54m

Portland

Wed 12/10

12:32 am-9:10 am

1 stop6h 38m

$249

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

Showing 1-10 of 59 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, September is the cheapest month in which you can book a flight from St. Louis to State of Washington (average of $121). Flying from St. Louis to State of Washington in February is currently the most expensive (average of $224). 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 October 30, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 19% on flights from St. Louis to State of Washington by exploring options for tickets in the afternoon.

What is the cheapest day to fly from St. Louis to State of Washington?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Washington. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their St. Louis to State of Washington flight should consider departing on Tuesday mornings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 October 30, 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
11,214 reviews

Overall

8.0

Entertainment

7.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

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
11,214 reviews
Alaska Airlines
8.0
Very good
11,214 reviews

Overall

8.0

Entertainment

7.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

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
4,242 reviews
Alaska Airlines
8.0
Very good
11,214 reviews

Overall

8.0

Entertainment

7.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

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
7.9
Good
7,993 reviews
Alaska Airlines
8.0
Very good
11,214 reviews

Overall

8.0

Entertainment

7.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

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
2,797 reviews
Alaska Airlines
8.0
Very good
11,214 reviews

Overall

8.0

Entertainment

7.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

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
11,030 reviews
Alaska Airlines
8.0
Very good
11,214 reviews

Overall

8.0

Entertainment

7.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

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?

    Southwest, Delta, and United Airlines can get you from St. Louis to State of Washington in just under 7h. Your travel time can differ by up to 3h 29m. St. Louis and State of Washington are separated by a distance of 1702 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 Frontier, which is currently one of the cheapest options available, starting at $77. Southwest flights start at $79 while deals on Delta start at $125 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 Finnair (100%), Qatar Airways (93%) and Japan Airlines (93%).

  • 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 $878, our data indicates the cheapest price to be $165. The most popular route (Lambert-St Louis - Seattle/Tacoma Intl), is priced around $151.

  • 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, September is the cheapest month in which you can book a flight from St. Louis to State of Washington (average of $121). Flying from St. Louis to State of Washington in February is currently the most expensive (average of $224). 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.

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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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$94Average$374FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$118Average$228FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$176Average$432FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$188Average$403FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$216Average$415FlexibilityNo cancel feeOn-time69%
Hawaiian AirlinesCheapest$237Average$380FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$241Average$501FlexibilityNo cancel feeOn-time75%

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