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$92+ 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 8/15. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SEA
Jul 21 — Jul 281
Mon 7/21
Mon 7/28
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 July 16, 2025.

Round-trip from

$229
(Delta)

One-way from

$92
(Priceline)

Popular in

July

Cheapest in

September

Average price

$456

Good round-trip deal

$339 or less

Good one-way deal

$198 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. 13% potential increase in price ($57 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 16, 2025.

This American Airlines deal was found by Cheapflights users on 7/16. 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.
Wed 9/247:23 amSTL - GEG
1 stop13h 54mAmerican Airlines
Sat 10/47:00 amGEG - STL
1 stop12h 53mAmerican Airlines
Deal found 7/16$241
This FlightHub deal was found by Cheapflights users on 7/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/77:52 pmSTL - PDX
1 stop28h 47mFrontier
Mon 10/136:05 amPDX - STL
1 stop25h 02mFrontier
Deal found 7/14$243
This Hawaiian Airlines deal was found by Cheapflights users on 7/15. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/316:00 amSTL - SEA
Nonstop4h 30mHawaiian Airlines
Sun 9/78:36 amSEA - STL
Nonstop4h 03mHawaiian Airlines
Deal found 7/15$247
This Delta deal was found by Cheapflights users on 7/16. 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.
Sat 9/138:40 amSTL - PDX
1 stop9h 11mDelta
Sat 9/201:20 pmPDX - STL
1 stop6h 01mDelta
Deal found 7/16$249
This Priceline deal was found by Cheapflights users on 7/14. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/127:55 pmSTL - SEA
1 stop6h 35mFrontier
Mon 9/1511:47 amSEA - STL
1 stop6h 57mFrontier
Deal found 7/14$250
This FlightHub deal was found by Cheapflights users on 7/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/137:55 pmSTL - GEG
1 stop17h 03mFrontier
Sun 9/2111:53 amGEG - STL
1 stop19h 13mFrontier
Deal found 7/14$255
This Southwest deal was found by Cheapflights users on 7/15. 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.
Sat 9/69:20 amSTL - SEA
Nonstop4h 20mSouthwest
Wed 9/106:45 amSEA - STL
1 stop9h 05mSouthwest
Deal found 7/15$259
This United Airlines deal was found by Cheapflights users on 7/14. 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.
Tue 8/191:39 pmSTL - SEA
1 stop6h 19mUnited Airlines
Tue 8/265:02 amSEA - STL
2 stops8h 42mUnited Airlines
Deal found 7/14$263
This American Airlines deal was found by Cheapflights users on 7/15. 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.
Tue 8/196:45 amSTL - SEA
1 stop9h 16mAmerican Airlines
Fri 8/226:34 amSEA - STL
1 stop8h 22mAmerican Airlines
Deal found 7/15$264
This Delta deal was found by Cheapflights users on 7/14. 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 8/272:25 pmSTL - SEA
1 stop6h 35mDelta
Sun 8/315:30 amSEA - STL
1 stop5h 59mDelta
Deal found 7/14$267
This Mytrip deal was found by Cheapflights users on 7/15. 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.
Thu 8/142:30 pmSTL - GEG
2 stops20h 35mMultiple Airlines
Thu 8/2111:53 amGEG - STL
2 stops23h 39mMultiple Airlines
Deal found 7/15$275
This Alaska Airlines deal was found by Cheapflights users on 7/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/197:32 pmSTL - SEA
Nonstop4h 28mAlaska Airlines
Sun 8/248:38 amSEA - STL
Nonstop4h 01mAlaska Airlines
Deal found 7/15$277

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 July 16, 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. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 8/22

5:30 pm-11:31 pm

1 stop8h 01m

Portland

Sat 8/30

5:06 pm-12:39 am

1 stop5h 33m

$229

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Wed 9/24

7:23 am-7:17 pm

1 stop13h 54m

Spokane

Sat 10/4

7:00 am-9:53 pm

1 stop12h 53m

$241

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Sun 8/31

6:00 am-8:30 am

Nonstop4h 30m

Seattle/Tacoma Intl

Sun 9/7

8:36 am-2:39 pm

Nonstop4h 03m

$247

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 9/5

6:30 pm-12:15 am

1 stop7h 45m

Portland

Fri 9/12

1:24 pm-11:59 pm

1 stop8h 35m

$248

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 8/29

7:54 pm-12:15 am

1 stop6h 21m

Portland

Fri 9/5

11:13 am-8:44 pm

1 stop7h 31m

$250

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Fri 9/12

7:55 pm-12:30 am

1 stop6h 35m

Seattle/Tacoma Intl

Mon 9/15

11:47 am-8:44 pm

1 stop6h 57m

$250

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Tue 8/19

7:32 pm-10:00 pm

Nonstop4h 28m

Seattle/Tacoma Intl

Thu 8/21

8:38 am-2:39 pm

Nonstop4h 01m

$253

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Sat 9/13

7:55 pm-10:58 am

1 stop17h 03m

Spokane

Sun 9/21

11:53 am-9:06 am

1 stop19h 13m

$255

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Sat 9/6

9:20 am-11:40 am

Nonstop4h 20m

Seattle/Tacoma Intl

Sat 9/13

11:10 pm-7:55 am

1 stop6h 45m

$259

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Tue 8/19

1:39 pm-5:58 pm

1 stop6h 19m

Seattle/Tacoma Intl

Tue 8/26

5:02 am-3:44 pm

2 stops8h 42m

$263

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/16

Showing 1-10 of 57 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 July 16, 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 July 16, 2025.

The most flights from STL to USWA are scheduled on a Wednesday (16 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 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 July 16, 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

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Southwest
8.0
Very good
4,241 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Delta
8.0
Very good
7,959 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Hawaiian Airlines
7.8
Good
2,580 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
United Airlines
7.4
Good
8,863 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.

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 45 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • 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 $92. Spirit Airlines flights start at $103 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 Qatar Airways (92%), Japan Airlines (85%) and Finnair (83%).

  • 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 $1,732, our data indicates the cheapest price to be $124. The most popular route (Lambert-St Louis - Seattle/Tacoma Intl), is priced around $197.

  • 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 July 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$94Average$358FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$106Average$172FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$179Average$439FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$196Average$415FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$216Average$417FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$236Average$514FlexibilityNo cancel feeOn-time75%
Hawaiian AirlinesCheapest$243Average$398FlexibilityNo cancel feeOn-time85%

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