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$88+ 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 5/17. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SEA
Apr 20 — Apr 271
Sun 4/20
Sun 4/27
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 April 15, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$189
(Delta)

One-way from

$88
(Cheapflightsfares)

Popular in

July

Cheapest in

September

Average price

$317

Good round-trip deal

$407 or less

Good one-way deal

$193 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
Search Deals
One-way flight from Lambert-St Louis to Washington
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($78 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Price to beat on a round-trip flight from Lambert-St Louis to Washington.
Search Deals
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 April 15, 2025.

This Delta deal was found by Cheapflights users on 4/14. 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.
Thu 7/242:18 pmSTL - SEA
1 stop10h 07mDelta
Tue 7/297:20 amSEA - STL
1 stop8h 43mDelta
Deal found 4/14$189
This Southwest deal was found by Cheapflights users on 4/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/44:55 pmSTL - SEA
1 stop8h 10mSouthwest
Wed 7/910:40 pmSEA - STL
2 stops10h 55mSouthwest
Deal found 4/14$194
This Frontier deal was found by Cheapflights users on 4/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/286:58 pmSTL - SEA
1 stop7h 46mFrontier
Thu 5/16:00 amSEA - STL
1 stop7h 07mFrontier
Deal found 4/14$198
This Expedia deal was found by Cheapflights users on 4/14. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/306:58 pmSTL - SEA
1 stop7h 46mMultiple Airlines
Wed 5/76:03 pmSEA - STL
Nonstop3h 56mMultiple Airlines
Deal found 4/14$213
This Delta deal was found by Cheapflights users on 4/14. 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.
Tue 6/37:19 pmSTL - PDX
1 stop6h 24mDelta
Tue 6/1011:13 pmPDX - STL
1 stop8h 24mDelta
Deal found 4/14$227
This CheapOair deal was found by Cheapflights users on 4/13. 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 4/286:58 pmSTL - PDX
1 stop7h 44mFrontier
Fri 5/26:20 amPDX - STL
1 stop25h 39mFrontier
Deal found 4/13$228
This American Airlines deal was found by Cheapflights users on 4/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/135:00 amSTL - SEA
1 stop7h 15mAmerican Airlines
Mon 5/191:10 amSEA - STL
1 stop6h 44mAmerican Airlines
Deal found 4/14$233
This Alaska Airlines deal was found by Cheapflights users on 4/14. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/66:30 amSTL - SEA
Nonstop4h 24mAlaska Airlines
Tue 5/136:03 pmSEA - STL
Nonstop3h 56mAlaska Airlines
Deal found 4/14$237
This Hawaiian Airlines deal was found by Cheapflights users on 4/14. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/66:30 amSTL - SEA
Nonstop4h 24mHawaiian Airlines
Fri 5/166:04 pmSEA - STL
Nonstop4h 00mHawaiian Airlines
Deal found 4/14$243
This United Airlines deal was found by Cheapflights users on 4/14. 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.
Fri 5/25:29 pmSTL - SEA
1 stop7h 13mUnited Airlines
Tue 5/69:00 amSEA - STL
2 stops10h 01mUnited Airlines
Deal found 4/14$248
This Expedia deal was found by Cheapflights users on 4/14. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/296:30 amSTL - PDX
1 stop6h 22mMultiple Airlines
Thu 5/16:20 amPDX - STL
1 stop6h 47mMultiple Airlines
Deal found 4/14$257
This American Airlines deal was found by Cheapflights users on 4/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/275:19 amSTL - PDX
1 stop7h 30mAmerican Airlines
Sat 5/3111:59 pmPDX - STL
1 stop7h 57mAmerican Airlines
Deal found 4/14$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 April 15, 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

Tue 5/6

11:15 am-5:51 pm

1 stop8h 36m

Seattle/Tacoma Intl

Fri 5/16

10:55 pm-9:35 am

1 stop8h 40m

$189

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Fri 7/4

4:55 pm-11:05 pm

1 stop8h 10m

Seattle/Tacoma Intl

Wed 7/9

10:40 pm-11:35 am

2 stops10h 55m

$194

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Mon 4/28

6:58 pm-12:44 am

1 stop7h 46m

Seattle/Tacoma Intl

Thu 5/1

6:00 am-3:07 pm

1 stop7h 07m

$198

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Wed 4/30

6:58 pm-12:44 am

1 stop7h 46m

Seattle/Tacoma Intl

Wed 5/7

6:03 pm-11:59 pm

Nonstop3h 56m

$213

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Tue 6/3

7:19 pm-11:43 pm

1 stop6h 24m

Portland

Tue 6/10

11:13 pm-9:37 am

1 stop8h 24m

$227

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Mon 4/28

6:58 pm-12:42 am

1 stop7h 44m

Portland

Fri 5/2

6:20 am-9:59 am

1 stop25h 39m

$228

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Tue 5/13

5:00 am-10:15 am

1 stop7h 15m

Seattle/Tacoma Intl

Mon 5/19

1:10 am-9:54 am

1 stop6h 44m

$233

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Tue 5/6

6:30 am-8:54 am

Nonstop4h 24m

Seattle/Tacoma Intl

Tue 5/13

6:03 pm-11:59 pm

Nonstop3h 56m

$237

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Tue 5/6

6:30 am-8:54 am

Nonstop4h 24m

Seattle/Tacoma Intl

Fri 5/16

6:04 pm-12:04 am

Nonstop4h 00m

$243

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Fri 5/2

5:29 pm-10:42 pm

1 stop7h 13m

Seattle/Tacoma Intl

Tue 5/6

9:00 am-9:01 pm

2 stops10h 01m

$248

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/14

Showing 1-10 of 53 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 July is currently the most expensive (average of $411). 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 April 15, 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 April 15, 2025.

The most flights from STL to USWA are scheduled on a Monday (11 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (4 on average).

Rainfall in Washington by month

Plan your trip to Washington by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in State of Washington ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit State of Washington when rainfall is around 0.7 in.

Temperature in Washington by month

Plan your trip to Washington by taking into account the average temperature totals by month.

If weather is an important factor for your trip to State of Washington, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

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 April 15, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest and Delta from St. Louis to Washington by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,876 reviews

Entertainment

7.1

Overall

8.0

Comfort

7.9

Food

7.1

Boarding

8.2

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Alaska Airlines
8.0
Very good
9,876 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Entertainment

7.1

Overall

8.0

Comfort

7.9

Food

7.1

Boarding

8.2

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Southwest
8.0
Very good
4,279 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Entertainment

7.1

Overall

8.0

Comfort

7.9

Food

7.1

Boarding

8.2

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Delta
8.0
Very good
7,917 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Entertainment

7.1

Overall

8.0

Comfort

7.9

Food

7.1

Boarding

8.2

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Hawaiian Airlines
7.9
Good
2,374 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Entertainment

7.1

Overall

8.0

Comfort

7.9

Food

7.1

Boarding

8.2

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
United Airlines
7.4
Good
8,658 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Entertainment

7.1

Overall

8.0

Comfort

7.9

Food

7.1

Boarding

8.2

Crew

8.5

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

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 42 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 $88. Delta flights start at $95 while deals on Southwest start at $100 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%), Hawaiian Airlines (88%) and Japan Airlines (86%).

  • 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 $1,237, our data indicates the cheapest price to be $124. The most popular route (Lambert-St Louis - Seattle/Tacoma Intl), is priced around $184.

  • 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 July is currently the most expensive (average of $411). 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 April 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$118Average$189FlexibilityNo cancel feeOn-time62%
DeltaCheapest$166Average$390FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$188Average$467FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$200Average$408FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$216Average$411FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$236Average$521FlexibilityNo cancel feeOn-time75%
Hawaiian AirlinesCheapest$237Average$411FlexibilityNo cancel feeOn-time85%

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