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$60+ 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 1/7. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — STL
Jan 20 — Jan 271
Tue 1/20
Tue 1/27
1 adult, Economy
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1. Tell us where you want to go

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Cheapflights Tip: The best prices from Washington, D.C. to Lambert-St Louis are usually found in August or October, booked 63 days in advance, depart on a Saturday or Tuesday and return on a Friday

Cheap 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 December 21, 2025.

This Frontier deal was found by Cheapflights users on 12/19. 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.
Sun 12/289:58 pmIAD - STL
1 stop12h 47mFrontier
Thu 1/110:42 amSTL - IAD
1 stop6h 34mFrontier
Deal found 12/19$308
This Kiwi.com deal was found by Cheapflights users on 12/19. 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.
Tue 12/308:50 pmBWI - STL
2 stops37h 50mMultiple Airlines
Tue 1/65:11 pmSTL - BWI
1 stop14h 18mMultiple Airlines
Deal found 12/19$324
This Delta deal was found by Cheapflights users on 12/19. 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 12/306:00 amBWI - STL
1 stop4h 24mDelta
Wed 12/315:55 pmSTL - BWI
1 stop4h 36mDelta
Deal found 12/19$351
This Kiwi.com deal was found by Cheapflights users on 12/19. 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.
Mon 12/2911:55 amBWI - STL
1 stop22h 45mMultiple Airlines
Tue 1/65:11 pmSTL - BWI
1 stop14h 18mMultiple Airlines
Deal found 12/19$362
This Kiwi.com deal was found by Cheapflights users on 12/19. 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.
Tue 12/308:50 pmBWI - STL
2 stops37h 50mFrontier
Sun 1/410:57 amSTL - BWI
1 stop22h 58mFrontier
Deal found 12/19$363
This Expedia deal was found by Cheapflights users on 12/19. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/309:58 pmIAD - STL
1 stop25h 35mFrontier
Sun 1/410:57 amSTL - IAD
1 stop5h 01mFrontier
Deal found 12/19$377
This Delta deal was found by Cheapflights users on 12/19. 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 12/306:00 amBWI - STL
1 stop4h 24mDelta
Fri 1/27:00 amSTL - BWI
1 stop4h 55mDelta
Deal found 12/19$382
This Delta deal was found by Cheapflights users on 12/19. 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 12/304:55 pmIAD - STL
1 stop25h 04mDelta
Thu 1/16:29 amSTL - IAD
1 stop4h 23mDelta
Deal found 12/19$383
This Kiwi.com deal was found by Cheapflights users on 12/19. 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 12/2711:55 amBWI - STL
1 stop22h 45mMultiple Airlines
Tue 1/65:11 pmSTL - BWI
1 stop14h 18mMultiple Airlines
Deal found 12/19$385
This Southwest deal was found by Cheapflights users on 12/20. 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 12/287:25 pmBWI - STL
2 stops5h 40mSouthwest
Wed 12/314:25 pmSTL - BWI
1 stop4h 20mSouthwest
Deal found 12/20$387
This Kiwi.com deal was found by Cheapflights users on 12/19. 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.
Sun 12/285:36 pmBWI - STL
2 stops17h 09mMultiple Airlines
Tue 1/65:11 pmSTL - BWI
1 stop14h 18mMultiple Airlines
Deal found 12/19$396
This Kiwi.com deal was found by Cheapflights users on 12/19. 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.
Tue 12/305:30 amBWI - STL
1 stop5h 10mFrontier
Mon 1/57:43 pmSTL - BWI
2 stops27h 46mFrontier
Deal found 12/19$398

Find 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 December 21, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$140
(Kiwi.com)

One-way from

$60
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$388

Good round-trip deal

$339 or less

Good one-way deal

$117 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.
Search Deals
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. 10% potential increase in price ($36 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Washington, D.C. (WAS) to Lambert-St Louis.
Search Deals
Price to beat on a one-way flight from Washington, D.C. (WAS) to Lambert-St Louis.
Search Deals

Cheapflights Fare Finder

 
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 December 21, 2025.
Use the filters below to find and compare flights from Washington, D.C. to St. Louis that are best for you.

Fly from

Washington, D.C.

Fly to

St. Louis

Route

Depart

Return

Price

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 1/22

6:15 am-11:33 pm

1 stop18h 18m

Lambert-St Louis

Sat 1/24

11:00 am-6:50 pm

1 stop6h 50m

$145

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Sat 1/31

4:44 pm-11:33 pm

1 stop7h 49m

Lambert-St Louis

Wed 2/4

8:22 pm-10:26 am

1 stop13h 04m

$155

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Mon 1/5

8:07 am-10:33 pm

1 stop15h 26m

Lambert-St Louis

Wed 1/7

5:11 pm-12:07 pm

1 stop17h 56m

$163

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Fri 1/30

4:44 pm-11:33 pm

1 stop7h 49m

Lambert-St Louis

Sun 2/1

5:42 pm-10:41 pm

1 stop27h 59m

$183

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 4/7

8:17 am-10:33 pm

1 stop15h 16m

Lambert-St Louis

Thu 4/9

10:42 am-5:52 pm

1 stop6h 10m

$184

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 1/29

1:22 pm-11:33 pm

1 stop11h 11m

Lambert-St Louis

Sun 2/1

5:42 pm-10:41 pm

1 stop27h 59m

$197

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 1/29

4:44 pm-11:33 pm

1 stop7h 49m

Lambert-St Louis

Sun 2/1

9:09 am-10:27 am

2 stops24h 18m

$200

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Fri 4/10

3:20 pm-7:13 am

1 stop16h 53m

Lambert-St Louis

Sat 4/11

3:30 pm-7:22 am

1 stop14h 52m

$219

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Sun 1/18

10:00 pm-6:51 am

1 stop9h 51m

Lambert-St Louis

Sun 1/25

5:42 pm-10:26 am

2 stops15h 44m

$238

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Sat 1/3

10:40 am-9:40 am

2 stops24h 00m

Lambert-St Louis

Tue 1/6

5:11 pm-8:29 am

1 stop14h 18m

$249

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/21

Showing 1-10 of 57 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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star

*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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Washington, D.C.-St. Louis flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. to St. Louis

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 December 12, 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 63 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, September is the cheapest month in which you can book a flight from Washington, D.C. to St. Louis (average of $109). Flying from Washington, D.C. to St. Louis in January is currently the most expensive (average of $222). 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 December 21, 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 24% on the cost of your flight, compared to a flight in the afternoon.

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 December 20, 2025.

Travelers seeking maximum savings on their Washington, D.C. to St. Louis flight should consider departing on Tuesday evenings when fares are most often at their lowest. Sunday afternoons 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 December 21, 2025.

The most flights from WAS to STL are scheduled on a Monday (15 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (8 on average).

How much does it cost to fly round-trip from Washington, D.C. to St. Louis?

What’s the top layover airport for flights from Washington, D.C. to St. Louis?

Share of 1-stop round-trip flights from Washington, D.C. to St. Louis chosen by Cheapflights users in the past 12 months, using the same layover each way.

Orlando (MCO) – chosen by Cheapflights users on 67% of 1-stop itineraries from Washington, D.C. to St. Louis on Cheapflights.

What’s the cheapest layover airport for flights from Washington, D.C. to St. Louis?

Average round-trip fare for 1-stop flights from Washington, D.C. to St. Louis, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Atlanta (ATL) is the most affordable 1-stop option, with an average round-trip price of $201.

What’s the fastest layover option from Washington, D.C. to St. Louis?

Shortest average travel time for 1-stop one-way flights from Washington, D.C. to St. Louis, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Atlanta (ATL) have the shortest average one-way travel time for 1-stop routes: 5h 12m.

Which airport typically offers the quickest layover for flights from Washington, D.C. to St. Louis?

Average layover duration for 1-stop one-way flights from Washington, D.C. to St. Louis, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Atlanta (ATL) offer the fastest connection on this route, with an average layover time of 1h 14m.

The best insider tips for Washington, D.C. to St. Louis flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. to St. Louis trip
Airports
DCA

DCA is easily accessible via the Metro, offering a clean and affordable way to reach the airport from D.C. and nearby Maryland.

Read more about DCABy Emily Zemler
IAD

IAD's Aerotrain connects the main terminal to concourses, but pay attention to signage for the correct train direction.

Read more about IADBy Ramsey Qubein
STL

STL's MetroLink offers a convenient and economical way to reach downtown St. Louis in about 40 minutes.

Read more about STLBy Taryn White
Our travel experts
Emily Zemler

Emily Zemler

Expert on DCA

Emily Zemler

Emily Zemler

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more
Taryn White

Taryn White

Expert on STL

Taryn White

Taryn White

Taryn White is a freelance travel writer, digital creator, and travel advisor who has visited nearly 100 countries and all 50 states. She’s familiar with many airports and enjoys beach hopping, boutique hotels, spa experiences, and exploring local culture. Her work has appeared in Travel + Leisure, Condé Nast Traveler, National Geographic, Smithsonian Magazine, AFAR, and more.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on IAD

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

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 December 21, 2025.
See what other customers who have flown with Southwest, Delta, and United Airlines from Washington, D.C. to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,257 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,257 reviews
Southwest
8.0
Very good
4,257 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Delta
7.9
Good
8,021 reviews
Southwest
8.0
Very good
4,257 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
United Airlines
7.4
Good
9,099 reviews
Southwest
8.0
Very good
4,257 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
American Airlines
7.2
Good
11,050 reviews
Southwest
8.0
Very good
4,257 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.8
Fair
3,082 reviews
Southwest
8.0
Very good
4,257 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

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. 5 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 12 inbound flights from Washington, D.C. per day.

  • How long is the flight from Washington, D.C. to St. Louis?

    A quick flight from Washington, D.C. to St. Louis can take about 2h 33m. Frontier provides one of the quickest options available for as low as $265. There are 694 mi between Washington, D.C. and St. Louis. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 $78 on this airline. Additional options worth looking into are Delta and American Airlines, starting at $124 and $173 round-trip. These flights start at 76% 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 $58. American Airlines flights start at $98 while deals on Southwest start at $98 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 most reliable airlines from Washington, D.C. to St. Louis?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Washington, D.C. to St. Louis on time: GoJet (72%), Avianca (72%), Copa Airlines (72%).

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

    The cheapest flight price from Washington, D.C. to St. Louis is $66. On average you can expect to pay $364. The most popular route, (Washington, D.C. Dulles Intl - Lambert-St Louis), can usually be booked for $235.

  • 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, September is the cheapest month in which you can book a flight from Washington, D.C. to St. Louis (average of $109). Flying from Washington, D.C. to St. Louis in January is currently the most expensive (average of $222). 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
Edwardsville
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Swansea
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 5 airlines flying from Washington, D.C. to St. Louis

Discover the top 5 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 December 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$198FlexibilityNo cancel feeOn-time62%
DeltaCheapest$130Average$279FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$172Average$328FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$187Average$353FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$223Average$400FlexibilityNo cancel feeOn-time69%

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