HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
St. Louis

$56+ 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 11/19. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — STL
Nov 21 — Nov 281
Fri 11/21
Fri 11/28
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Washington, D.C. to St. Louis with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Washington, D.C. to Lambert-St Louis are usually found in August or September, booked 66 days in advance, depart on a Tuesday or Wednesday and return on a Friday

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 October 22, 2025.

This CheapOair deal was found by Cheapflights users on 10/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/139:29 amBWI - STL
1 stop25h 51mFrontier
Mon 11/172:12 pmSTL - BWI
1 stop19h 08mFrontier
Deal found 10/19$144
This Frontier deal was found by Cheapflights users on 10/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/136:15 amBWI - STL
1 stop4h 57mFrontier
Fri 11/144:56 pmSTL - BWI
1 stop6h 17mFrontier
Deal found 10/20$145
This American Airlines deal was found by Cheapflights users on 10/21. 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.
Sun 12/145:00 amBWI - STL
1 stop4h 41mAmerican Airlines
Mon 12/155:15 amSTL - BWI
1 stop5h 07mAmerican Airlines
Deal found 10/21$149
This American Airlines deal was found by Cheapflights users on 10/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/57:21 pmBWI - STL
1 stop4h 45mAmerican Airlines
Fri 12/125:58 pmSTL - BWI
1 stop4h 35mAmerican Airlines
Deal found 10/20$150
This CheapOair deal was found by Cheapflights users on 10/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/149:13 amBWI - STL
1 stop7h 48mFrontier
Sun 11/162:12 pmSTL - BWI
1 stop17h 22mFrontier
Deal found 10/20$156
This Kiwi.com deal was found by Cheapflights users on 10/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/192:00 pmBWI - STL
1 stop10h 01mMultiple Airlines
Thu 11/2010:53 amSTL - BWI
1 stop11h 24mMultiple Airlines
Deal found 10/20$162
This CheapOair deal was found by Cheapflights users on 10/21. 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 12/45:45 amBWI - STL
1 stop6h 22mFrontier
Sun 12/73:30 pmSTL - BWI
1 stop15h 12mFrontier
Deal found 10/21$163
This Mytrip deal was found by Cheapflights users on 10/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/136:15 amBWI - STL
1 stop4h 57mFrontier
Sun 11/162:12 pmSTL - BWI
1 stop17h 22mFrontier
Deal found 10/20$165
This Mytrip deal was found by Cheapflights users on 10/19. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/206:29 pmBWI - STL
1 stop15h 38mFrontier
Mon 10/276:05 pmSTL - BWI
1 stop15h 15mFrontier
Deal found 10/19$168
This Kiwi.com deal was found by Cheapflights users on 10/19. 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.
Wed 12/38:00 amBWI - STL
1 stop28h 07mMultiple Airlines
Wed 12/107:43 pmSTL - BWI
2 stops27h 44mMultiple Airlines
Deal found 10/19$172
This Mytrip deal was found by Cheapflights users on 10/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/68:37 amBWI - STL
1 stop25h 22mFrontier
Sun 12/73:30 pmSTL - BWI
1 stop15h 12mFrontier
Deal found 10/20$173
This Mytrip deal was found by Cheapflights users on 10/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/165:50 amBWI - STL
1 stop5h 22mFrontier
Sun 11/162:12 pmSTL - BWI
1 stop17h 22mFrontier
Deal found 10/20$174

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 October 22, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$144
(CheapOair)

One-way from

$56
(Trip.com)

Popular in

October

Cheapest in

August

Average price

$393

Good round-trip deal

$299 or less

Good one-way deal

$149 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. 2% potential increase in price ($10 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 October 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 October 22, 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

Mon 12/15

6:21 pm-11:42 pm

1 stop6h 21m

Lambert-St Louis

Mon 12/22

5:59 pm-11:31 pm

1 stop4h 32m

$177

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 12/16

1:52 pm-6:33 pm

1 stop5h 41m

Lambert-St Louis

Mon 12/22

5:59 pm-11:31 pm

1 stop4h 32m

$177

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 1/17

8:40 am-10:13 am

Nonstop2h 33m

Lambert-St Louis

Sun 1/18

11:20 am-5:35 pm

1 stop5h 15m

$239

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 1/17

5:00 pm-9:13 pm

1 stop5h 13m

Lambert-St Louis

Sun 1/18

9:57 am-4:59 pm

1 stop6h 02m

$249

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 12/6

8:00 am-9:20 am

Nonstop2h 20m

Lambert-St Louis

Sun 12/7

7:55 am-12:50 pm

1 stop3h 55m

$255

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sun 1/11

7:15 pm-10:35 pm

1 stop4h 20m

Lambert-St Louis

Wed 1/14

3:05 pm-6:05 pm

Nonstop2h 00m

$259

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 11/15

8:40 am-10:07 am

Nonstop2h 27m

Lambert-St Louis

Tue 11/18

8:25 am-11:33 am

Nonstop2h 08m

$263

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 11/18

6:59 am-10:43 am

1 stop4h 44m

Lambert-St Louis

Mon 11/24

5:17 pm-11:41 pm

1 stop5h 24m

$266

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 11/15

6:00 am-9:45 am

1 stop4h 45m

Lambert-St Louis

Wed 11/19

8:45 am-11:40 am

Nonstop1h 55m

$273

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Tue 11/11

5:03 pm-8:46 pm

1 stop4h 43m

Lambert-St Louis

Tue 11/18

6:00 am-11:39 am

1 stop4h 39m

$283

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/20

Showing 1-10 of 58 results
1
2
3
...
6

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 October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust 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.

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 October 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 66 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 $199). 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 October 22, 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 October 19, 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 October 22, 2025.

The most flights from WAS to STL are scheduled on a Monday (17 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (2 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

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
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 October 22, 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
4,235 reviews

Boarding

8.1

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,235 reviews
Southwest
8.0
Very good
4,235 reviews

Boarding

8.1

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
7.9
Good
7,981 reviews
Southwest
8.0
Very good
4,235 reviews

Boarding

8.1

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,988 reviews
Southwest
8.0
Very good
4,235 reviews

Boarding

8.1

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
11,029 reviews
Southwest
8.0
Very good
4,235 reviews

Boarding

8.1

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,129 reviews
Southwest
8.0
Very good
4,235 reviews

Boarding

8.1

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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 20m. Delta provides one of the quickest options available for as low as $255. There are 717 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 $130 on this airline. Additional options worth looking into are Delta and American Airlines, starting at $149 and $175 round-trip. These flights start at 60% 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 Southwest, which is currently one of the cheapest options available, starting at $75. Delta flights start at $89 while deals on United Airlines start at $91 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 (84%), Avianca (84%), United Airlines (84%).

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

    The cheapest flight price from Washington, D.C. to St. Louis is $134. On average you can expect to pay $380. The most popular route, (Washington, D.C. Dulles Intl - Lambert-St Louis), can usually be booked for $201.

  • 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 $199). 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
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 October 22, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$112Average$197FlexibilityNo cancel feeOn-time62%
DeltaCheapest$130Average$279FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$175Average$328FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$188Average$346FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$223Average$403FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.