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$119+ 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 8/16. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SEA
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
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 junio 12, 2025.

Round-trip from

$194
(Southwest)

One-way from

$119
(Delta)

Popular in

July

Cheapest in

September

Average price

$417

Good round-trip deal

$325 or less

Good one-way deal

$184 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 June 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 junio 12, 2025.

This Southwest deal was found by Cheapflights users on 6/9. 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.
jue. 8/74:20 pmSTL - SEA
1 stop9h 45mSouthwest
mar. 8/1210:45 pmSEA - STL
1 stop10h 05mSouthwest
Deal found 6/9$194
This Delta deal was found by Cheapflights users on 6/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/186:59 pmSTL - SEA
1 stop7h 10mDelta
sáb. 9/275:45 pmSEA - STL
1 stop5h 37mDelta
Deal found 6/11$209
This American Airlines deal was found by Cheapflights users on 6/12. 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.
jue. 8/214:32 pmSTL - SEA
1 stop8h 23mAmerican Airlines
lun. 8/2512:45 amSEA - STL
1 stop10h 09mAmerican Airlines
Deal found 6/12$212
This United Airlines deal was found by Cheapflights users on 6/10. 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.
vie. 9/124:40 pmSTL - SEA
1 stop8h 19mUnited Airlines
sáb. 9/207:00 amSEA - STL
1 stop6h 44mUnited Airlines
Deal found 6/10$218
This CheapOair deal was found by Cheapflights users on 6/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/127:52 pmSTL - SEA
1 stop6h 39mFrontier
lun. 9/158:34 pmSEA - STL
1 stop10h 33mFrontier
Deal found 6/10$239
This Hawaiian Airlines deal was found by Cheapflights users on 6/11. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/183:24 pmSTL - SEA
Nonstop4h 26mHawaiian Airlines
lun. 9/811:34 amSEA - STL
Nonstop4h 00mHawaiian Airlines
Deal found 6/11$249
This FlightHub deal was found by Cheapflights users on 6/11. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/137:52 pmSTL - GEG
1 stop17h 16mFrontier
dom. 9/2112:08 pmGEG - STL
1 stop18h 59mFrontier
Deal found 6/11$276
This Gotogate deal was found by Cheapflights users on 6/11. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/187:29 pmSTL - PDX
1 stop29h 10mFrontier
lun. 9/86:05 amPDX - STL
1 stop25h 02mFrontier
Deal found 6/11$277
This Delta deal was found by Cheapflights users on 6/10. 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.
mié. 8/63:41 pmSTL - GEG
1 stop8h 18mDelta
mar. 8/125:05 pmGEG - STL
1 stop5h 33mDelta
Deal found 6/10$279
This American Airlines deal was found by Cheapflights users on 6/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/35:55 amSTL - PDX
1 stop10h 38mAmerican Airlines
sáb. 9/66:07 amPDX - STL
1 stop7h 17mAmerican Airlines
Deal found 6/9$282
This Southwest deal was found by Cheapflights users on 6/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/194:35 pmSTL - GEG
2 stops7h 55mSouthwest
mar. 8/266:15 amGEG - STL
1 stop8h 40mSouthwest
Deal found 6/10$284
This Delta deal was found by Cheapflights users on 6/10. 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.
sáb. 9/137:30 amSTL - PDX
1 stop7h 07mDelta
vie. 9/1912:40 amPDX - STL
1 stop6h 04mDelta
Deal found 6/10$297

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 junio 12, 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

jue. 8/7

4:20 pm-12:05 am

1 stop9h 45m

Seattle/Tacoma Intl

mar. 8/12

10:45 pm-10:50 am

1 stop10h 05m

$194

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

jue. 8/21

4:32 pm-10:55 pm

1 stop8h 23m

Seattle/Tacoma Intl

lun. 8/25

12:45 am-12:54 pm

1 stop10h 09m

$212

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

sáb. 8/16

7:35 am-12:33 pm

1 stop6h 58m

Seattle/Tacoma Intl

mar. 8/19

5:30 am-1:29 pm

1 stop5h 59m

$213

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

mié. 7/9

5:00 am-9:50 am

1 stop6h 50m

Seattle/Tacoma Intl

mié. 7/16

7:00 am-4:45 pm

1 stop7h 45m

$247

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

lun. 8/18

3:24 pm-5:50 pm

Nonstop4h 26m

Seattle/Tacoma Intl

lun. 9/8

11:34 am-5:34 pm

Nonstop4h 00m

$249

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

lun. 8/11

7:29 pm-12:34 am

1 stop7h 05m

Seattle/Tacoma Intl

dom. 8/17

7:48 pm-9:11 am

1 stop11h 23m

$260

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

lun. 8/18

7:29 pm-10:39 pm

1 stop29h 10m

Portland

lun. 9/8

6:05 am-9:07 am

1 stop25h 02m

$277

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

mié. 8/6

3:41 pm-9:59 pm

1 stop8h 18m

Spokane

mar. 8/12

5:05 pm-12:38 am

1 stop5h 33m

$279

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

mié. 9/3

5:55 am-2:33 pm

1 stop10h 38m

Portland

sáb. 9/6

6:07 am-3:24 pm

1 stop7h 17m

$282

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

mar. 8/19

4:35 pm-10:30 pm

2 stops7h 55m

Spokane

mar. 8/26

6:15 am-4:55 pm

1 stop8h 40m

$284

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

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 July is currently the most expensive (average of $391). 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 junio 12, 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 junio 12, 2025.

The most flights from STL to USWA are scheduled on a Thursday (15 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (6 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 junio 12, 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
10,000 reviews

Overall

8.0

Entertainment

7.1

Comfort

7.8

Food

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Comfort

7.8

Food

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Comfort

7.8

Food

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Comfort

7.8

Food

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Comfort

7.8

Food

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Comfort

7.8

Food

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 40 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 Delta, which is currently one of the cheapest options available, starting at $119. Southwest flights start at $120 while deals on Hawaiian Airlines start at $122 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 Japan Airlines (87%), Qatar Airways (86%) and American Airlines (80%).

  • 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 $1,118, our data indicates the cheapest price to be $124. The most popular route (Lambert-St Louis - Seattle/Tacoma Intl), is priced around $179.

  • 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 $391). 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 junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$94Average$369FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$110Average$183FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$188Average$452FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$196Average$417FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$216Average$419FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$236Average$516FlexibilityNo cancel feeOn-time75%
Hawaiian AirlinesCheapest$241Average$415FlexibilityNo cancel feeOn-time85%

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