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$84+ 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 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SEA
ago. 3 — ago. 101
dom. 8/3
dom. 8/10
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 julio 29, 2025.

Round-trip from

$228
(Hawaiian Airlines)

One-way from

$84
(United Airlines)

Popular in

July

Cheapest in

September

Average price

$458

Good round-trip deal

$343 or less

Good one-way deal

$223 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 ($56 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 julio 29, 2025.

This Hawaiian Airlines deal was found by Cheapflights users on 7/28. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/233:35 pmSTL - PDX
1 stop9h 12mHawaiian Airlines
mar. 9/306:05 amPDX - STL
1 stop6h 34mHawaiian Airlines
Deal found 7/28$228
This Delta deal was found by Cheapflights users on 7/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/136:00 amSTL - PDX
1 stop8h 35mDelta
vie. 9/1912:45 amPDX - STL
1 stop5h 52mDelta
Deal found 7/29$229
This FlightHub deal was found by Cheapflights users on 7/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/137:55 pmSTL - GEG
1 stop17h 03mFrontier
dom. 9/2111:53 amGEG - STL
1 stop19h 13mFrontier
Deal found 7/27$235
This Alaska Airlines deal was found by Cheapflights users on 7/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/46:30 pmSTL - SEA
Nonstop4h 29mAlaska Airlines
lun. 9/86:03 pmSEA - STL
Nonstop3h 56mAlaska Airlines
Deal found 7/29$237
This American Airlines deal was found by Cheapflights users on 7/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/1612:20 pmSTL - SEA
1 stop8h 56mAmerican Airlines
jue. 8/215:24 amSEA - STL
1 stop9h 22mAmerican Airlines
Deal found 7/28$242
This FlightHub deal was found by Cheapflights users on 7/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/237:54 pmSTL - SEA
1 stop15h 40mFrontier
mar. 8/266:41 amSEA - STL
1 stop24h 30mFrontier
Deal found 7/28$245
This Frontier deal was found by Cheapflights users on 7/28. 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.
vie. 8/87:29 pmSTL - PDX
1 stop6h 46mFrontier
mar. 8/127:01 pmPDX - STL
1 stop12h 10mFrontier
Deal found 7/28$248
This Hawaiian Airlines deal was found by Cheapflights users on 7/28. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/106:33 amSTL - SEA
Nonstop4h 32mHawaiian Airlines
lun. 10/136:02 pmSEA - STL
Nonstop4h 01mHawaiian Airlines
Deal found 7/28$249
This Delta deal was found by Cheapflights users on 7/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/35:30 pmSTL - SEA
1 stop6h 44mDelta
mié. 9/107:10 amSEA - STL
2 stops12h 08mDelta
Deal found 7/29$251
This Alaska Airlines deal was found by Cheapflights users on 7/26. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/86:33 amSTL - GEG
1 stop8h 04mAlaska Airlines
mar. 10/213:40 pmGEG - STL
1 stop6h 23mAlaska Airlines
Deal found 7/26$252
This Alaska Airlines deal was found by Cheapflights users on 7/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/87:00 amSTL - PDX
1 stop7h 38mAlaska Airlines
dom. 11/165:30 pmPDX - STL
1 stop19h 48mAlaska Airlines
Deal found 7/28$253
This Delta deal was found by Cheapflights users on 7/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/278:40 amSTL - GEG
1 stop6h 37mDelta
mar. 9/305:03 pmGEG - STL
1 stop5h 35mDelta
Deal found 7/28$253

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 julio 29, 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

mar. 9/23

3:35 pm-10:47 pm

1 stop9h 12m

Portland

mar. 9/30

6:05 am-2:39 pm

1 stop6h 34m

$228

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

sáb. 9/13

7:40 am-12:15 pm

1 stop6h 35m

Portland

vie. 9/19

12:45 am-11:30 am

1 stop8h 45m

$229

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

sáb. 9/13

7:55 pm-10:58 am

1 stop17h 03m

Spokane

dom. 9/21

11:53 am-9:06 am

1 stop19h 13m

$235

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

sáb. 8/16

12:20 pm-7:16 pm

1 stop8h 56m

Seattle/Tacoma Intl

jue. 8/21

5:24 am-4:46 pm

1 stop9h 22m

$242

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

sáb. 8/23

7:54 pm-9:34 am

1 stop15h 40m

Seattle/Tacoma Intl

mar. 8/26

6:41 am-9:11 am

1 stop24h 30m

$245

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

vie. 8/8

7:29 pm-12:15 am

1 stop6h 46m

Portland

mar. 8/12

7:01 pm-9:11 am

1 stop12h 10m

$248

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

vie. 10/10

6:33 am-9:05 am

Nonstop4h 32m

Seattle/Tacoma Intl

lun. 10/13

6:02 pm-12:03 am

Nonstop4h 01m

$249

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

mar. 8/26

7:35 am-2:43 pm

1 stop9h 08m

Seattle/Tacoma Intl

sáb. 9/6

7:10 am-9:18 pm

2 stops12h 08m

$251

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

mié. 10/8

6:33 am-12:37 pm

1 stop8h 04m

Spokane

mar. 10/21

3:40 pm-12:03 am

1 stop6h 23m

$252

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

sáb. 9/27

7:40 am-11:55 am

1 stop6h 15m

Spokane

mar. 9/30

5:03 pm-12:38 am

1 stop5h 35m

$253

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 56 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 $389). 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 julio 29, 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 julio 29, 2025.

The most flights from STL to USWA are scheduled on a Monday (15 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (3 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 julio 29, 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

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
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

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Southwest
8.0
Very good
4,238 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,979 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Hawaiian Airlines
7.8
Good
2,605 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,896 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

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 United Airlines, which is currently one of the cheapest options available, starting at $84. Delta flights start at $89 while deals on American Airlines start at $94 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 (89%), Japan Airlines (87%) and Finnair (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 $1,748, our data indicates the cheapest price to be $124. The most popular route (Lambert-St Louis - Seattle/Tacoma Intl), is priced around $177.

  • 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 $389). 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 julio 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$94Average$370FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$100Average$165FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$179Average$438FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$193Average$411FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$213Average$519FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$216Average$407FlexibilityNo cancel feeOn-time69%
Hawaiian AirlinesCheapest$241Average$397FlexibilityNo cancel feeOn-time85%

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