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$67+ Cheap flights from Reagan-National (DCA) 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 2/18. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — STL
Dec 31 — Jan 71
Wed 12/31
Wed 1/7
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. Reagan-National to Lambert-St Louis are usually found in August or February, booked 76 days in advance, depart on a Tuesday or Wednesday and return on a Saturday

Find flight deals from Reagan-National to St. Louis

Cheapest flights from Reagan-National to St. Louis
Explore the most affordable flight options available from Reagan-National to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 1, 2025.

This American Airlines deal was found by Cheapflights users on 11/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/1311:40 amDCA - STL
Nonstop2h 33mAmerican Airlines
Sat 1/179:54 amSTL - DCA
Nonstop2h 05mAmerican Airlines
Deal found 11/29$235
This Kiwi.com deal was found by Cheapflights users on 12/1. 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 12/168:00 amDCA - STL
1 stop27h 14mFrontier
Tue 1/65:11 pmSTL - DCA
2 stops42h 50mFrontier
Deal found 12/1$240
This Mytrip deal was found by Cheapflights users on 11/30. 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 12/42:00 pmDCA - STL
1 stop21h 14mFrontier
Mon 12/87:43 pmSTL - DCA
1 stop16h 23mFrontier
Deal found 11/30$243
This Delta deal was found by Cheapflights users on 11/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/1312:37 pmDCA - STL
1 stop6h 23mDelta
Sat 1/176:00 amSTL - DCA
1 stop5h 16mDelta
Deal found 11/29$255
This CheapOair deal was found by Cheapflights users on 12/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/168:00 amDCA - STL
1 stop27h 14mFrontier
Wed 12/317:43 pmSTL - DCA
1 stop25h 16mFrontier
Deal found 12/1$258
This CheapOair deal was found by Cheapflights users on 11/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/56:00 pmDCA - STL
1 stop17h 14mFrontier
Sat 12/67:43 pmSTL - DCA
1 stop16h 23mFrontier
Deal found 11/29$269
This Mytrip deal was found by Cheapflights users on 11/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/22:00 pmDCA - STL
1 stop21h 14mFrontier
Wed 12/37:43 pmSTL - DCA
1 stop16h 23mFrontier
Deal found 11/29$273
This Southwest deal was found by Cheapflights users on 11/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/298:00 amDCA - STL
Nonstop2h 20mSouthwest
Mon 1/58:30 amSTL - DCA
Nonstop1h 55mSouthwest
Deal found 11/29$295
This Southwest deal was found by Cheapflights users on 12/1. 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.
Sat 12/206:45 pmDCA - STL
Nonstop2h 25mSouthwest
Wed 1/78:20 amSTL - DCA
Nonstop1h 55mSouthwest
Deal found 12/1$301
This Southwest deal was found by Cheapflights users on 12/1. 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 12/162:45 pmDCA - STL
Nonstop2h 20mSouthwest
Tue 1/61:05 pmSTL - DCA
Nonstop1h 55mSouthwest
Deal found 12/1$308

Cheap flight deals from Reagan-National to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Reagan-National (DCA) 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 1, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$235
(American Airlines)

One-way from

$67
(Southwest)

Popular in

December

Cheapest in

August

Average price

$459

Good round-trip deal

$349 or less

Good one-way deal

$183 or less
Provider with most accurate pricing for Washington, D.C. Reagan-National-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. Reagan-National-Lambert-St Louis flights.
Search Deals
From Washington, D.C. Reagan-National to Lambert-St Louis
Search Deals
One-way flight from Washington, D.C. Reagan-National to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($71 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($13 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. Reagan-National to Lambert-St Louis.
Search Deals
Price to beat on a one-way flight from Washington, D.C. Reagan-National to Lambert-St Louis.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Reagan-National 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 1, 2025.
Use the filters below to find and compare flights from Washington, D.C. Reagan-National Airport to St. Louis that are best for you.

Fly from

Reagan-National

Fly to

St. Louis

Route

Depart

Return

Price

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 12/13

12:37 pm-6:00 pm

1 stop6h 23m

Lambert-St Louis

Sat 1/17

6:00 am-12:16 pm

1 stop5h 16m

$255

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Wed 2/4

6:00 pm-11:37 pm

1 stop6h 37m

Lambert-St Louis

Thu 2/5

6:00 am-11:20 am

1 stop4h 20m

$285

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 1/22

11:00 am-5:05 pm

2 stops7h 05m

Lambert-St Louis

Mon 1/26

8:20 am-1:00 pm

1 stop3h 40m

$287

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 12/29

8:00 am-9:20 am

Nonstop2h 20m

Lambert-St Louis

Mon 1/5

8:30 am-11:25 am

Nonstop1h 55m

$295

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 12/20

6:45 pm-8:10 pm

Nonstop2h 25m

Lambert-St Louis

Wed 1/7

8:20 am-11:15 am

Nonstop1h 55m

$301

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Fri 2/13

3:05 pm-4:40 pm

Nonstop2h 35m

Lambert-St Louis

Sun 2/15

9:50 am-6:00 pm

2 stops7h 10m

$305

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Fri 1/30

11:00 am-5:05 pm

2 stops7h 05m

Lambert-St Louis

Sat 1/31

7:40 am-4:15 pm

2 stops7h 35m

$306

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 2/12

6:25 pm-11:30 pm

2 stops6h 05m

Lambert-St Louis

Sun 2/15

9:50 am-6:00 pm

2 stops7h 10m

$309

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Fri 2/13

8:00 am-9:35 am

Nonstop2h 35m

Lambert-St Louis

Mon 2/16

8:30 am-1:00 pm

1 stop3h 30m

$312

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 12/16

6:10 am-1:00 pm

1 stop7h 50m

Lambert-St Louis

Tue 1/6

6:00 pm-9:00 pm

Nonstop2h 00m

$312

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/1

Showing 1-10 of 22 results
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Compare providers for flights from Reagan-National 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 Reagan-National 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
PricelinePrice Accuracy1 starTrust 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. Reagan-National Airport-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. Reagan-National Airport-St. Louis flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Washington, D.C. Reagan-National Airport-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C. Reagan-National Airport-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. Reagan-National Airport-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 Reagan-National to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Reagan-National 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. Reagan-National Airport to St. Louis

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

Use this chart to determine the optimal time to book a round-trip flight from Reagan-National to St. Louis. Price data was last updated on November 28, 2025.

The best time to book flights from Washington, D.C. Reagan-National Airport to St. Louis is 57 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, September is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to St. Louis (average of $154). Flying from Washington, D.C. Reagan-National Airport to St. Louis in December is currently the most expensive (average of $268). 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 DCA to STL?

Find hourly flight availability from Reagan-National 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 1, 2025.

It’s optimal to fly from Washington, D.C. Reagan-National Airport to St. Louis at noon. By choosing this option you can save up to 15% on the cost of your flight, compared to a flight in the afternoon.

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

Use this chart to determine the cheapest time to fly round-trip from Reagan-National to St. Louis. Price data was last updated on November 29, 2025.

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

The best insider tips for Washington, D.C. Reagan-National Airport 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. Reagan-National Airport to St. Louis trip
Airports
DCA

For a stress-free departure, reserve parking online at DCA as lots fill up quickly, especially during busy times.

Read more about DCAby Emily Zemler
STL

Use the MetroLink light rail for an economical and convenient ride from STL to downtown St. Louis, taking 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

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 1, 2025.
Peruse reviews from past customers who have flown with Southwest, Delta, and United Airlines from Washington, D.C. Reagan-National Airport to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,253 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Southwest
8.0
Very good
4,253 reviews
Southwest
8.0
Very good
4,253 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Delta
7.9
Good
8,010 reviews
Southwest
8.0
Very good
4,253 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
United Airlines
7.4
Good
9,065 reviews
Southwest
8.0
Very good
4,253 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
American Airlines
7.2
Good
11,041 reviews
Southwest
8.0
Very good
4,253 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Related info for your journey

Find useful and relevant information for your journey from Reagan-National 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. Reagan-National?

    Lambert-St Louis (STL) is the airport you will fly into if you book a flight from Washington, D.C. Reagan-National to St. Louis. You should not have trouble finding flights to Lambert-St Louis from Washington, D.C. Reagan-National; the airport handles an average of 2 inbound flights from Washington, D.C. Reagan-National per day. You should also have plenty of airline options to choose from since 4 airlines have flights to the St. Louis airport from Washington, D.C. Reagan-National. It is only a 12.7 mi journey from Lambert-St Louis (STL) to St. Louis’s city center.

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

    For as low as $255, Delta can have you in St. Louis from Washington, D.C. Reagan-National Airport in 6h 23m. The distance between Washington, D.C. Reagan-National Airport and St. Louis is about 717 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    According to our current data, American Airlines ($173), Southwest ($187), and Delta ($223) offers the cheapest pricing from Washington, D.C. Reagan-National Airport to St. Louis. American Airlines is 47% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the most reliable airlines from Washington, D.C. Reagan-National Airport 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. Reagan-National Airport to St. Louis on time: Envoy Air (92%), Republic Airways (84%), Southwest (77%).

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

    Looking at all options, your cheapest flight can be booked for $118. While the most popular route (Washington, D.C. Reagan-National - Lambert-St Louis) can be booked for $235 on average, our data indicates $310 when flying from Washington, D.C. Reagan-National Airport to St. Louis.

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

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

  • How can I find direct flights from Reagan-National to St. Louis?

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

  • Can I find deals for business class flights from Reagan-National to St. Louis?

    Yes. Cheapflights offers flight deals from Reagan-National 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. Reagan-National Airport to St. Louis?

    Currently, September is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to St. Louis (average of $154). Flying from Washington, D.C. Reagan-National Airport to St. Louis in December is currently the most expensive (average of $268). 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

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Alternative routes for Reagan-National to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Reagan-National to St. Louis

Discover the top 4 airlines that operate flights from Reagan-National 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 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$173Average$328FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$187Average$328FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$223Average$336FlexibilityNo cancel feeOn-time69%
DeltaCheapest$223Average$323FlexibilityNo cancel feeOn-timeN/A

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