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St. Louis

$89+ Cheap flights from Washington to St. Louis (STL)

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 8/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — STL
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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Cheap flight deals from Washington to St. Louis

Keep the following information in mind while searching for Washington to St. Louis flight deals. Data was last updated July 29, 2025.

Round-trip from

$174
(United Airlines)

One-way from

$89
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$465

Good round-trip deal

$303 or less

Good one-way deal

$198 or less
From Washington to Lambert-St Louis
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One-way flight from Washington to Lambert-St Louis
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Highest demand for flights based on searches. 6% potential increase in price ($25 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 July 2025
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Price to beat on a round-trip flight from Washington to Lambert-St Louis.
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Price to beat on a one-way flight from Washington to Lambert-St Louis.
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Find flight deals from Washington to St. Louis

Cheapest flights from Washington to St. Louis
Explore the most affordable flight options available from Washington to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/37:00 amSEA - STL
1 stop6h 44mUnited Airlines
Fri 9/55:49 pmSTL - SEA
1 stop7h 10mUnited Airlines
Deal found 7/28$174
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.
Tue 8/2611:55 pmSEA - STL
1 stop8h 42mDelta
Tue 9/27:35 amSTL - SEA
1 stop9h 08mDelta
Deal found 7/29$177
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/310:07 pmSEA - STL
1 stop9h 28mAmerican Airlines
Wed 12/39:40 amSTL - SEA
1 stop9h 23mAmerican Airlines
Deal found 7/27$183
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/68:36 amSEA - STL
Nonstop4h 03mHawaiian Airlines
Sat 9/133:35 pmSTL - SEA
Nonstop4h 19mHawaiian Airlines
Deal found 7/29$214
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2111:52 amGEG - STL
1 stop19h 19mFrontier
Sat 8/237:54 pmSTL - GEG
1 stop17h 13mFrontier
Deal found 7/29$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.
Sun 8/248:38 amSEA - STL
Nonstop4h 01mAlaska Airlines
Sat 8/306:00 amSTL - SEA
Nonstop4h 30mAlaska Airlines
Deal found 7/29$237
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/196:41 amSEA - STL
1 stop24h 30mFrontier
Sat 8/237:54 pmSTL - SEA
1 stop15h 40mFrontier
Deal found 7/29$248
This Hawaiian Airlines 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/279:25 amGEG - STL
1 stop6h 09mHawaiian Airlines
Tue 9/306:00 amSTL - GEG
1 stop7h 30mHawaiian Airlines
Deal found 7/27$252
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/205:15 amGEG - STL
1 stop5h 28mUnited Airlines
Sat 8/234:40 pmSTL - GEG
1 stop6h 23mUnited Airlines
Deal found 7/28$253
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/258:35 pmSEA - STL
1 stop12h 05mSouthwest
Tue 12/27:00 amSTL - SEA
1 stop8h 25mSouthwest
Deal found 7/29$262
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/206:15 amGEG - STL
2 stops14h 00mSouthwest
Sat 8/236:30 amSTL - GEG
1 stop7h 00mSouthwest
Deal found 7/28$264
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.
Wed 9/37:44 pmGEG - STL
1 stop16h 55mAlaska Airlines
Sun 9/76:00 amSTL - GEG
1 stop8h 46mAlaska Airlines
Deal found 7/28$265

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington to St. Louis 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 29, 2025.
Use the filters below to find and compare flights from Washington to St. Louis that are best for you.

Fly from

Washington

Fly to

St. Louis

Route

Depart

Return

Price

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 9/3

7:00 am-3:44 pm

1 stop6h 44m

Lambert-St Louis

Fri 9/5

5:49 pm-10:59 pm

1 stop7h 10m

$174

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 8/27

6:34 am-4:56 pm

1 stop8h 22m

Lambert-St Louis

Wed 9/3

2:11 pm-10:29 pm

1 stop10h 18m

$177

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 9/10

5:30 am-1:30 pm

1 stop6h 00m

Lambert-St Louis

Fri 9/12

7:00 pm-11:59 pm

1 stop6h 59m

$183

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sat 9/6

8:36 am-2:39 pm

Nonstop4h 03m

Lambert-St Louis

Sat 9/13

3:35 pm-5:54 pm

Nonstop4h 19m

$214

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Thu 8/21

11:52 am-9:11 am

1 stop19h 19m

Lambert-St Louis

Sat 8/23

7:54 pm-11:07 am

1 stop17h 13m

$235

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sun 8/24

8:38 am-2:39 pm

Nonstop4h 01m

Lambert-St Louis

Sat 8/30

6:00 am-8:30 am

Nonstop4h 30m

$237

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 8/19

6:41 am-9:11 am

1 stop24h 30m

Lambert-St Louis

Sat 8/23

7:54 pm-9:34 am

1 stop15h 40m

$248

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Sat 9/27

9:25 am-5:34 pm

1 stop6h 09m

Lambert-St Louis

Tue 9/30

6:00 am-11:30 am

1 stop7h 30m

$252

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Wed 8/20

5:15 am-12:43 pm

1 stop5h 28m

Lambert-St Louis

Sat 8/23

4:40 pm-9:03 pm

1 stop6h 23m

$253

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 9/4

12:05 pm-6:05 pm

Nonstop4h 00m

Lambert-St Louis

Sun 9/7

6:05 pm-1:20 am

1 stop9h 15m

$259

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/26

Showing 1-10 of 60 results
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Best time to book a flight from Washington to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Washington 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 Washington to St. Louis

What is the cheapest month to book a flight from State of Washington to St. Louis?

Currently, August is the cheapest month in which you can book a flight from State of Washington to St. Louis (average of $311). Flying from State of Washington to St. Louis in March is currently the most expensive (average of $356). 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 WA to STL?

Find hourly flight availability from Washington to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 29, 2025.

When flying from State of Washington to St. Louis, 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 State of Washington to St. Louis

Explore weekly flight availability from Washington to St. Louis. 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 29, 2025.

The most flights from USWA to STL are scheduled on a Monday (16 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (4 on average).

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated July 29, 2025.
See what other customers who have flown with Alaska Airlines, Southwest, and Delta from Washington to St. Louis have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Comfort

7.8

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

Food

7.1

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Comfort

7.8

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

Food

7.1

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Comfort

7.8

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
7,977 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Comfort

7.8

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

Food

7.1

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Comfort

7.8

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
8,899 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Comfort

7.8

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 Washington to St. Louis. 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 into for flights to St. Louis from Washington?

    Lambert-St Louis (STL), located 12.7 mi from the city center, is the airport you fly into when you book flights from Washington to St. Louis.

  • How popular is this State of Washington to St. Louis flight route?

    This flight path from Washington to Lambert-St Louis was viewed by 4 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 State of Washington to St. Louis one-way?

    One-way options have recently been found by users for as low as $89 on Frontier. Other airlines that offer cheap prices include Hawaiian Airlines from $108 and Alaska Airlines from $111 one-way.

  • What are the most popular routes from State of Washington to St. Louis?

    The most popular flight routes from State of Washington to St. Louis are Seattle/Tacoma Intl - Lambert-St Louis, Portland - Lambert-St Louis and Spokane - Lambert-St Louis.

  • What are the most reliable airlines from State of Washington to St. Louis?

    The top 3 most reliable airlines when flying from State of Washington to St. Louis are American Airlines (66%), Alaska Airlines (65%) and Hawaiian Airlines (65%).

  • What are the cheapest flights from State of Washington to St. Louis?

    The cheapest flight price from State of Washington to St. Louis is $126. On average you can expect to pay $576. The most popular route, (Seattle/Tacoma Intl - Lambert-St Louis), can usually be booked for $174.

  • Can I find deals for flights from Washington to St. Louis that include hotel bookings?

    Yes. In addition to deals on Washington to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to St. Louis.

  • Can I find deals for business class flights from Washington to St. Louis?

    Yes. Cheapflights offers flight deals from Washington to St. Louis 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 State of Washington to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from State of Washington to St. Louis (average of $311). Flying from State of Washington to St. Louis in March is currently the most expensive (average of $356). 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

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
O'Fallon
Maryland Heights
Fairview Heights
Collinsville
Eureka
St. Peters
Glencoe
Alton
Chesterfield
Festus
Farmington

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Alternative routes for Washington to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
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Top 7 airlines flying from Washington to St. Louis

Discover the top 7 airlines that operate flights from Washington to St. Louis. 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 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$134Average$270FlexibilityNo cancel feeOn-time62%
DeltaCheapest$182Average$382FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$186Average$451FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$188Average$435FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$216Average$412FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$236Average$525FlexibilityNo cancel feeOn-time75%
Hawaiian AirlinesCheapest$237Average$384FlexibilityNo cancel feeOn-time85%

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