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$55+ Cheap flights from Washington, D.C. (WAS) 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 2/22. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — STL
Jan 28 — Feb 41
Tue 1/28
Tue 2/4
1 adult, Economy
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The best prices from Washington, D.C. to Lambert-St Louis are usually found in August or April, booked 61 days in advance, depart on a Wednesday or Friday and return on a Friday

Cheap flight deals from Washington, D.C. to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 23, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$120
(CheapOair)

One-way from

$55
(Frontier)

Popular in

March

Cheapest in

August

Average price

$367

Good round-trip deal

$288 or less

Good one-way deal

$148 or less
Provider with most accurate pricing for Washington, D.C. (WAS)-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Lambert-St Louis flights.
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From Washington, D.C. (WAS) to Lambert-St Louis
Search Deals
One-way flight from Washington, D.C. (WAS) to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($13 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in January 2025
Search Deals
Price to beat on a round-trip flight from Washington, D.C. (WAS) to Lambert-St Louis.
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Price to beat on a one-way flight from Washington, D.C. (WAS) to Lambert-St Louis.
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Find flight deals from Washington, D.C. to St. Louis

Cheapest flights from Washington, D.C. to St. Louis
Explore the most affordable flight options available from Washington, D.C. to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 23, 2025.

This CheapOair deal was found by Cheapflights users on 1/23. 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.
Sat 2/224:10 pmBWI - STL
1 stop8h 33mFrontier
Sat 3/15:20 pmSTL - BWI
1 stop13h 01mFrontier
Deal found 1/23$120
This Justfly.com deal was found by Cheapflights users on 1/23. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/208:45 amBWI - STL
1 stop6h 57mMultiple Airlines
Tue 2/255:20 pmSTL - BWI
1 stop13h 01mMultiple Airlines
Deal found 1/23$149
This Southwest deal was found by Cheapflights users on 1/23. 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.
Thu 2/136:35 amBWI - STL
Nonstop2h 35mSouthwest
Mon 2/179:05 pmSTL - BWI
Nonstop2h 00mSouthwest
Deal found 1/23$179
This Mytrip deal was found by Cheapflights users on 1/23. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/185:25 amBWI - STL
1 stop10h 17mSpirit Airlines
Thu 2/204:00 pmSTL - BWI
1 stop16h 43mSpirit Airlines
Deal found 1/23$192
This Delta deal was found by Cheapflights users on 1/23. 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 3/276:00 amBWI - STL
1 stop4h 36mDelta
Wed 4/26:50 amSTL - BWI
1 stop3h 53mDelta
Deal found 1/23$197
This American Airlines deal was found by Cheapflights users on 1/23. 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.
Sat 3/15:28 pmBWI - STL
1 stop7h 28mAmerican Airlines
Wed 3/59:29 amSTL - BWI
1 stop6h 01mAmerican Airlines
Deal found 1/23$217
This United Airlines deal was found by Cheapflights users on 1/22. 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 2/278:35 amIAD - STL
Nonstop2h 30mUnited Airlines
Sat 3/111:20 amSTL - IAD
1 stop6h 41mUnited Airlines
Deal found 1/22$231
This Southwest deal was found by Cheapflights users on 1/22. 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.
Thu 2/136:05 amDCA - STL
1 stop6h 05mSouthwest
Sun 2/168:45 amSTL - DCA
Nonstop1h 55mSouthwest
Deal found 1/22$233
This American Airlines deal was found by Cheapflights users on 1/22. 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.
Fri 2/219:14 pmDCA - STL
Nonstop2h 30mAmerican Airlines
Fri 2/286:25 pmSTL - DCA
1 stop4h 16mAmerican Airlines
Deal found 1/22$237
This Delta deal was found by Cheapflights users on 1/22. 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.
Fri 2/217:25 amIAD - STL
1 stop5h 21mDelta
Sun 2/237:07 pmSTL - IAD
1 stop4h 13mDelta
Deal found 1/22$243
This Delta deal was found by Cheapflights users on 1/22. 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 2/136:00 amDCA - STL
1 stop6h 46mDelta
Mon 2/175:59 pmSTL - DCA
1 stop12h 38mDelta
Deal found 1/22$243
This Mytrip deal was found by Cheapflights users on 1/22. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/307:00 amDCA - STL
1 stop27h 16mFrontier
Sat 2/17:09 pmSTL - DCA
1 stop15h 57mFrontier
Deal found 1/22$251

Find flights from Washington, D.C. to St. Louis within your budget

Customize your flight search to find flights from Washington, D.C. 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 January 23, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Sat 2/22

4:10 pm-11:43 pm

1 stop8h 33m

Lambert-St Louis

Sat 3/1

5:20 pm-7:21 am

1 stop13h 01m

$120

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 2/20

8:45 am-2:42 pm

1 stop6h 57m

Lambert-St Louis

Tue 2/25

5:20 pm-7:21 am

1 stop13h 01m

$149

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 2/13

6:35 am-8:10 am

Nonstop2h 35m

Lambert-St Louis

Mon 2/17

9:05 pm-12:05 am

Nonstop2h 00m

$179

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 2/18

5:25 am-2:42 pm

1 stop10h 17m

Lambert-St Louis

Thu 2/20

4:00 pm-9:43 am

1 stop16h 43m

$192

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 3/27

6:00 am-9:36 am

1 stop4h 36m

Lambert-St Louis

Wed 4/2

6:50 am-11:43 am

1 stop3h 53m

$197

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Sat 3/1

5:28 pm-11:56 pm

1 stop7h 28m

Lambert-St Louis

Wed 3/5

9:29 am-4:30 pm

1 stop6h 01m

$217

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 2/27

8:35 am-10:05 am

Nonstop2h 30m

Lambert-St Louis

Sat 3/1

11:20 am-7:01 pm

1 stop6h 41m

$231

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 2/13

6:05 am-11:10 am

1 stop6h 05m

Lambert-St Louis

Sun 2/16

8:45 am-11:40 am

Nonstop1h 55m

$233

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 4/5

7:35 am-11:56 am

1 stop5h 21m

Lambert-St Louis

Mon 4/7

10:30 am-4:18 pm

1 stop4h 48m

$237

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Fri 2/21

9:14 pm-10:44 pm

Nonstop2h 30m

Lambert-St Louis

Fri 2/28

6:00 am-11:36 am

1 stop4h 36m

$237

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/23

Showing 1-10 of 35 results
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Compare providers for flights from Washington, D.C. to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Washington, D.C. to St. Louis in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Washington, D.C.-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C.-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C.-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C.-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C.-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Washington, D.C. to St. Louis

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

Travel insights for flights from Washington, D.C. to St. Louis

Get recent, data-driven insights about flights from Washington, D.C. to St. Louis including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from Washington, D.C. to St. Louis?

Use this chart to determine the optimal time to book a round-trip flight from Washington, D.C. to St. Louis. Price data was last updated on January 17, 2025.

To ensure you get the cheapest price possible for a flight from Washington, D.C. to St. Louis, you should look to book at least 61 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Washington, D.C. to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Washington, D.C. to St. Louis (average of $311). Flying from Washington, D.C. 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 WAS to STL?

Find hourly flight availability from Washington, D.C. 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 January 23, 2025.

It’s optimal to fly from Washington, D.C. to St. Louis in the evening. By choosing this option you can save up to 26% on the cost of your flight, compared to a flight in the morning.

What is the cheapest day to fly from Washington, D.C. to St. Louis?

Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to St. Louis. Price data was last updated on January 21, 2025.

Travelers seeking maximum savings on their Washington, D.C. to St. Louis flight should consider departing on Tuesday at noon when fares are most often at their lowest. Wednesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Washington, D.C. to St. Louis

Explore weekly flight availability from Washington, D.C. 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 January 23, 2025.

The most flights from WAS to STL are scheduled on a Monday (18 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 January 23, 2025.
To help decide which airline to fly from Washington, D.C. to St. Louis, see what other customers have to say about Southwest, American Airlines and Frontier. 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.
Southwest
8.1
Very good
4,647 reviews

Food

7.2

Entertainment

7.7

Overall

8.1

Comfort

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,647 reviews
Southwest
8.1
Very good
4,647 reviews

Food

7.2

Entertainment

7.7

Overall

8.1

Comfort

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,508 reviews
Southwest
8.1
Very good
4,647 reviews

Food

7.2

Entertainment

7.7

Overall

8.1

Comfort

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,971 reviews
Southwest
8.1
Very good
4,647 reviews

Food

7.2

Entertainment

7.7

Overall

8.1

Comfort

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,647 reviews

Food

7.2

Entertainment

7.7

Overall

8.1

Comfort

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Sun Country Air
7.0
Good
386 reviews
Southwest
8.1
Very good
4,647 reviews

Food

7.2

Entertainment

7.7

Overall

8.1

Comfort

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. 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, D.C.?

    Lambert-St Louis (STL), located 12.7 mi from the city center, is the airport you fly into when you book flights from Washington, D.C. to St. Louis. 6 airlines have flights to Lambert-St Louis from Washington, D.C. on a regular basis. Booking flights from Washington, D.C. to Lambert-St Louis should not be difficult; the airport handles an average of 13 inbound flights from Washington, D.C. per day.

  • How popular is this Washington, D.C. to St. Louis flight route?

    Within the past month, 4 users have taken a look at flights from Washington, D.C. to Lambert-St Louis.

  • What are the cheapest airlines flying from Washington, D.C. to St. Louis round-trip?

    Our cheapest airline available from Washington, D.C. to St. Louis is Frontier. Our recent data shows that you can find tickets from as low as $120 on this airline. Additional options worth looking into are Southwest and Spirit Airlines, starting at $179 and $192 round-trip. These flights start at 63% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Washington, D.C. to St. Louis one-way?

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $55. Spirit Airlines flights start at $71 while deals on Southwest start at $90 one-way.

  • What are the most popular routes from Washington, D.C. to St. Louis?

    When deciding which route to take from Washington, D.C. to St. Louis consider Washington, D.C. Dulles Intl - Lambert-St Louis, Washington, D.C. Reagan-National - Lambert-St Louis or Baltimore/Washington - Lambert-St Louis as they are the most popular.

  • What are the cheapest flights from Washington, D.C. to St. Louis?

    The cheapest flight price from Washington, D.C. to St. Louis is $159. On average you can expect to pay $354. The most popular route, (Washington, D.C. Dulles Intl - Lambert-St Louis), can usually be booked for $155.

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

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

  • How can I find direct flights from Washington, D.C. 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, D.C. to St. Louis.

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

    Yes. Cheapflights offers flight deals from Washington, D.C. 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 Washington, D.C. to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Washington, D.C. to St. Louis (average of $311). Flying from Washington, D.C. 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, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Fenton
Fairview Heights
Maryland Heights
Collinsville
Wentzville
Eureka
St. Peters
Festus
Alton
Farmington
Chesterfield

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Top 6 airlines flying from Washington, D.C. to St. Louis

Discover the top 6 airlines that operate flights from Washington, D.C. 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 January 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$98Average$167FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$133Average$189FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$158Average$440FlexibilityNo cancel feeOn-time69%
DeltaCheapest$175Average$319FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$183Average$358FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$220Average$369FlexibilityNo cancel feeOn-time63%
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