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$115+ 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 7/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — STL
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$229
(Delta)

One-way from

$115
(Delta)

Popular in

July

Cheapest in

September

Average price

$413

Good round-trip deal

$329 or less

Good one-way deal

$164 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 ($26 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 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 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 June 12, 2025.

This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2412:40 amSEA - STL
1 stop6h 04mDelta
Sun 9/286:59 pmSTL - SEA
1 stop7h 10mDelta
Deal found 6/12$229
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/310:40 pmSEA - STL
1 stop7h 05mSouthwest
Fri 8/84:40 pmSTL - SEA
1 stop9h 35mSouthwest
Deal found 6/11$233
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.
Wed 10/16:05 amPDX - STL
1 stop25h 02mFrontier
Tue 10/77:52 pmSTL - PDX
1 stop28h 47mFrontier
Deal found 6/10$244
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.
Thu 11/63:45 pmSEA - STL
1 stop19h 49mFrontier
Sun 11/92:19 pmSTL - SEA
1 stop26h 41mFrontier
Deal found 6/10$248
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/316:06 pmSEA - STL
Nonstop3h 53mAlaska Airlines
Tue 8/53:24 pmSTL - SEA
Nonstop4h 26mAlaska Airlines
Deal found 6/10$249
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.
Wed 8/136:34 amSEA - STL
1 stop8h 22mAmerican Airlines
Mon 8/183:53 pmSTL - SEA
1 stop8h 07mAmerican Airlines
Deal found 6/12$253
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/312:20 amSEA - STL
1 stop8h 20mUnited Airlines
Tue 7/85:15 amSTL - SEA
1 stop6h 44mUnited Airlines
Deal found 6/12$258
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.
Tue 8/125:18 pmPSC - STL
1 stop5h 20mDelta
Wed 8/207:11 pmSTL - PSC
1 stop6h 15mDelta
Deal found 6/10$261
This Sun Country Air 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1411:59 pmSEA - STL
1 stop9h 31mSun Country Air
Sun 8/178:00 amSTL - SEA
1 stop16h 50mSun Country Air
Deal found 6/10$275
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.
Tue 8/195:05 pmGEG - STL
1 stop5h 33mDelta
Wed 8/278:46 amSTL - GEG
1 stop6h 30mDelta
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.
Wed 8/133:22 pmPDX - STL
1 stop6h 54mAmerican Airlines
Wed 8/201:42 pmSTL - PDX
1 stop11h 38mAmerican 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.
Tue 8/196:15 amGEG - STL
1 stop8h 40mSouthwest
Tue 8/262:25 pmSTL - GEG
2 stops9h 40mSouthwest
Deal found 6/10$284

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 June 12, 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 9/24

12:40 am-8:44 am

1 stop6h 04m

Lambert-St Louis

Sun 9/28

6:59 pm-12:09 am

1 stop7h 10m

$229

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sun 8/3

10:40 pm-7:45 am

1 stop7h 05m

Lambert-St Louis

Fri 8/8

4:40 pm-12:15 am

1 stop9h 35m

$233

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 10/1

6:05 am-9:07 am

1 stop25h 02m

Lambert-St Louis

Tue 10/7

7:52 pm-10:39 pm

1 stop28h 47m

$244

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 11/6

3:45 pm-1:34 pm

1 stop19h 49m

Lambert-St Louis

Sun 11/9

2:19 pm-3:00 pm

1 stop26h 41m

$248

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 7/31

6:06 pm-11:59 pm

Nonstop3h 53m

Lambert-St Louis

Tue 8/5

3:24 pm-5:50 pm

Nonstop4h 26m

$249

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 8/13

6:34 am-4:56 pm

1 stop8h 22m

Lambert-St Louis

Mon 8/18

3:53 pm-10:00 pm

1 stop8h 07m

$253

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 7/3

12:20 am-10:40 am

1 stop8h 20m

Lambert-St Louis

Tue 7/8

5:15 am-9:59 am

1 stop6h 44m

$258

PascoSt. Louis

PSC - STL

PSCSTL

Pasco Tri Cities

Tue 8/12

5:18 pm-12:38 am

1 stop5h 20m

Lambert-St Louis

Wed 8/20

7:11 pm-11:26 pm

1 stop6h 15m

$261

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 8/14

11:59 pm-11:30 am

1 stop9h 31m

Lambert-St Louis

Sun 8/17

8:00 am-10:50 pm

1 stop16h 50m

$275

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Tue 8/19

5:05 pm-12:38 am

1 stop5h 33m

Lambert-St Louis

Tue 8/26

6:45 pm-10:30 pm

1 stop5h 45m

$279

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

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 June 12, 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 June 12, 2025.

The most flights from USWA to STL are scheduled on a Thursday (17 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 on average).

Rainfall in St. Louis by month

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

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

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

If weather is an important factor for your trip to St. Louis, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

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 June 12, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Washington to St. Louis to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Boarding

8.1

Comfort

7.8

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

Food

7.1

Boarding

8.1

Comfort

7.8

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

Food

7.1

Boarding

8.1

Comfort

7.8

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
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Boarding

8.1

Comfort

7.8

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

Food

7.1

Boarding

8.1

Comfort

7.8

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

Food

7.1

Boarding

8.1

Comfort

7.8

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 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 5 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 $115 on Delta. Other airlines that offer cheap prices include American Airlines from $118 and United Airlines from $122 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 Hawaiian Airlines (85%), Alaska Airlines (83%) and Air Tahiti Nui (83%).

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

    The cheapest flight price from State of Washington to St. Louis is $124. On average you can expect to pay $311. The most popular route, (Seattle/Tacoma Intl - Lambert-St Louis), can usually be booked for $179.

  • 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 Washington?

Book flights to Washington if you plan to visit one of these locations
O'Fallon
Maryland Heights
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Collinsville
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St. Peters
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Alternative routes for Washington to St. Louis

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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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$134Average$260FlexibilityNo cancel feeOn-time62%
DeltaCheapest$186Average$381FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$186Average$444FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$188Average$443FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$216Average$414FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$236Average$509FlexibilityNo cancel feeOn-time75%
Hawaiian AirlinesCheapest$237Average$388FlexibilityNo cancel feeOn-time85%

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