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Reagan-National

$71+ Cheap flights from St. Louis (STL) to Reagan-National (DCA)

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 1/16. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DCA
Nov 23 — Nov 301
Sun 11/23
Sun 11/30
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Washington, D.C. Reagan-National are usually found in August or April, booked 50 days in advance, depart on a Saturday or Tuesday and return on a Tuesday

Cheap flight deals from St. Louis to Reagan-National

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Reagan-National (DCA). 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 24, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$201
(American Airlines)

One-way from

$71
(Kiwi.com)

Popular in

October

Cheapest in

August

Average price

$354

Good round-trip deal

$300 or less

Good one-way deal

$168 or less
Provider with most accurate pricing for Lambert-St Louis-Washington, D.C. Reagan-National flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Washington, D.C. Reagan-National flights.
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From Lambert-St Louis to Washington, D.C. Reagan-National
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One-way flight from Lambert-St Louis to Washington, D.C. Reagan-National
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Highest demand for flights based on searches. 6% potential increase in price ($19 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Price to beat on a round-trip flight from Lambert-St Louis to Washington, D.C. Reagan-National.
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Price to beat on a one-way flight from Lambert-St Louis to Washington, D.C. Reagan-National.
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Find flight deals from St. Louis to Reagan-National

Cheapest flights from St. Louis to Reagan-National
Explore the most affordable flight options available from St. Louis to Reagan-National. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 24, 2025.

This American Airlines deal was found by Cheapflights users on 10/23. 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.
Mon 12/83:22 pmSTL - DCA
1 stop7h 34mAmerican Airlines
Fri 12/126:00 amDCA - STL
1 stop8h 29mAmerican Airlines
Deal found 10/23$201
This American Airlines deal was found by Cheapflights users on 10/23. 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.
Thu 11/277:11 amSTL - DCA
1 stop4h 49mAmerican Airlines
Sat 12/63:54 pmDCA - STL
Nonstop2h 34mAmerican Airlines
Deal found 10/23$202
This American Airlines deal was found by Cheapflights users on 10/23. 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.
Thu 12/411:50 amSTL - DCA
1 stop6h 21mAmerican Airlines
Sat 12/611:40 amDCA - STL
Nonstop2h 33mAmerican Airlines
Deal found 10/23$203
This Booking.com deal was found by Cheapflights users on 10/23. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/27:45 pmSTL - DCA
1 stop16h 17mFrontier
Wed 11/58:00 amDCA - STL
1 stop26h 07mFrontier
Deal found 10/23$204
This Booking.com deal was found by Cheapflights users on 10/23. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/247:52 pmSTL - DCA
1 stop25h 07mFrontier
Mon 10/276:31 pmDCA - STL
1 stop15h 36mFrontier
Deal found 10/23$210
This American Airlines deal was found by Cheapflights users on 10/23. 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.
Sun 12/145:59 pmSTL - DCA
Nonstop2h 15mAmerican Airlines
Tue 12/167:59 pmDCA - STL
Nonstop2h 48mAmerican Airlines
Deal found 10/23$213
This American Airlines deal was found by Cheapflights users on 10/23. 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.
Tue 11/258:39 amSTL - DCA
1 stop4h 45mAmerican Airlines
Wed 12/312:15 pmDCA - STL
Nonstop2h 26mAmerican Airlines
Deal found 10/23$214
This Kiwi.com deal was found by Cheapflights users on 10/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/67:43 pmSTL - DCA
1 stop16h 23mFrontier
Sat 12/136:00 pmDCA - STL
2 stops16h 47mFrontier
Deal found 10/22$216
This United Airlines deal was found by Cheapflights users on 10/23. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/277:00 amSTL - DCA
1 stop6h 37mUnited Airlines
Sat 12/66:00 pmDCA - STL
1 stop5h 45mUnited Airlines
Deal found 10/23$217
This American Airlines deal was found by Cheapflights users on 10/23. 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.
Wed 12/1010:13 amSTL - DCA
1 stop6h 27mAmerican Airlines
Sun 1/117:40 amDCA - STL
Nonstop2h 44mAmerican Airlines
Deal found 10/23$218
This American Airlines deal was found by Cheapflights users on 10/23. 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.
Thu 12/117:12 amSTL - DCA
1 stop6h 12mAmerican Airlines
Sun 1/117:40 amDCA - STL
Nonstop2h 44mAmerican Airlines
Deal found 10/23$221
This Mytrip deal was found by Cheapflights users on 10/22. 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.
Sat 10/257:52 pmSTL - DCA
1 stop16h 10mFrontier
Mon 10/278:00 amDCA - STL
1 stop26h 07mFrontier
Deal found 10/22$223

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Reagan-National 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 24, 2025.
Use the filters below to find and compare flights from St. Louis to Washington, D.C. Reagan-National Airport that are best for you.

Fly from

St. Louis

Fly to

Reagan-National

Route

Depart

Return

Price

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sun 11/2

7:45 pm-1:02 pm

1 stop16h 17m

Washington, D.C. Reagan-National

Wed 11/5

8:00 am-9:07 am

1 stop26h 07m

$204

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 12/4

10:35 am-6:20 pm

2 stops6h 45m

Washington, D.C. Reagan-National

Sat 12/6

12:20 pm-1:40 pm

Nonstop2h 20m

$231

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 12/10

7:00 am-2:25 pm

1 stop6h 25m

Washington, D.C. Reagan-National

Mon 1/12

6:00 pm-11:59 pm

1 stop6h 59m

$255

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 12/9

5:27 pm-10:42 pm

1 stop4h 15m

Washington, D.C. Reagan-National

Mon 1/12

6:00 pm-11:59 pm

1 stop6h 59m

$255

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Fri 2/13

7:41 am-2:13 pm

1 stop5h 32m

Washington, D.C. Reagan-National

Tue 2/17

5:00 pm-9:00 pm

1 stop5h 00m

$258

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 12/10

7:00 am-3:20 pm

1 stop7h 20m

Washington, D.C. Reagan-National

Sun 1/11

6:00 pm-11:59 pm

1 stop6h 59m

$258

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 12/13

6:42 pm-11:59 pm

1 stop4h 17m

Washington, D.C. Reagan-National

Fri 1/9

10:30 am-2:30 pm

1 stop5h 00m

$258

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 12/9

5:27 pm-10:42 pm

1 stop4h 15m

Washington, D.C. Reagan-National

Fri 1/9

10:30 am-2:30 pm

1 stop5h 00m

$258

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Fri 2/27

7:41 am-2:13 pm

1 stop5h 32m

Washington, D.C. Reagan-National

Sun 3/1

10:30 am-2:29 pm

1 stop4h 59m

$262

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 11/25

11:35 am-5:25 pm

1 stop4h 50m

Washington, D.C. Reagan-National

Wed 12/3

10:30 am-3:40 pm

1 stop6h 10m

$264

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/23

Showing 1-10 of 21 results
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Compare providers for flights from St. Louis to Reagan-National

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 St. Louis to Reagan-National in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust 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 St. Louis-Washington, D.C. Reagan-National Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Washington, D.C. Reagan-National Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Washington, D.C. Reagan-National Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Washington, D.C. Reagan-National Airport 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 St. Louis-Washington, D.C. Reagan-National Airport 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 St. Louis to Reagan-National

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

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

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Reagan-National. Price data was last updated on October 17, 2025.

The best time to book flights from St. Louis to Washington, D.C. Reagan-National Airport is 50 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 St. Louis to Washington, D.C. Reagan-National Airport?

Currently, July is the cheapest month in which you can book a flight from St. Louis to Washington, D.C. Reagan-National Airport (average of $102). Flying from St. Louis to Washington, D.C. Reagan-National Airport in January is currently the most expensive (average of $229). 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 STL to DCA?

Find hourly flight availability from St. Louis to Reagan-National. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 24, 2025.

It’s optimal to fly from St. Louis to Washington, D.C. Reagan-National Airport in the evening. By choosing this option you can save up to 12% on the cost of your flight, compared to a flight in the morning.

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

Expect security screening at STL to take 5-10 minutes off-peak, but check online for real-time wait times during peak periods.

Read more about STLby Taryn White
DCA

DCA is easily accessible via the Metro, with a dedicated stop on the Yellow and Blue lines, making it the most affordable transport option.

Read more about DCAby Emily Zemler
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 Reagan-National

Get insights into the airlines that provide service to Reagan-National. 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 Reagan-National. Reviews last updated October 24, 2025.
Get a feel of what it's like to fly with Southwest, American Airlines, and Frontier from St. Louis to Washington, D.C. Reagan-National Airport by reading reviews from past customers. Users have also rated airlines 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

Crew

8.6

Entertainment

7.5

Overall

8.0

Food

7.0

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

Crew

8.6

Entertainment

7.5

Overall

8.0

Food

7.0

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
11,034 reviews
Southwest
8.0
Very good
4,235 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Entertainment

7.5

Overall

8.0

Food

7.0

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
3,128 reviews
Southwest
8.0
Very good
4,235 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Entertainment

7.5

Overall

8.0

Food

7.0

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 St. Louis to Reagan-National. 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 from for flights from St. Louis to Washington, D.C. Reagan-National?

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Washington, D.C. Reagan-National. On average, Lambert-St Louis has 5 outbound flights to Washington, D.C. Reagan-National per day from 3 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

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

    Airlines like Frontier, Southwest, and United Airlines fly from St. Louis to Washington, D.C. Reagan-National Airport in about 6h 25m. The time it takes to get you to your destination can typically vary by up to 9h 52m. The distance from St. Louis to Washington, D.C. Reagan-National Airport is about 717 mi. 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 St. Louis to Washington, D.C. Reagan-National Airport round-trip?

    According to our current data, Frontier ($124), American Airlines ($170), and Southwest ($198) offers the cheapest pricing from St. Louis to Washington, D.C. Reagan-National Airport. Frontier is priced at 58% lower than the current average price of a flight leaving 3 months from now.

  • What are the most reliable airlines from St. Louis to Washington, D.C. Reagan-National Airport?

    Before booking your flight to Washington, D.C. Reagan-National Airport from St. Louis, check out the most reliable airlines to get you to your destination on time: Republic Airways (84%), American Airlines (78%), PSA Airlines( 76%).

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

    While on average a flight from St. Louis to Washington, D.C. Reagan-National Airport is generally $398, our data shows the cheapest flight currently is $118. When looking at the most popular route, (Lambert-St Louis - Washington, D.C. Reagan-National), you can expect to pay $163 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to Reagan-National 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 St. Louis to Washington, D.C. Reagan-National Airport?

    Currently, July is the cheapest month in which you can book a flight from St. Louis to Washington, D.C. Reagan-National Airport (average of $102). Flying from St. Louis to Washington, D.C. Reagan-National Airport in January is currently the most expensive (average of $229). 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. Reagan-National Airport?

Book flights to Washington, D.C. Reagan-National Airport if you plan to visit one of these locations
Alexandria
Woodbridge
Tysons
Arlington
Springfield
Silver Spring
Hanover
Gaithersburg
Fredericksburg
Fairfax
Linthicum Heights
Falls Church
Owings Mills
Manassas
Largo
Oxon Hill
Laurel
Towson
National Harbor
Waldorf

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Top 3 airlines flying from St. Louis to Reagan-National

Discover the top 3 airlines that operate flights from St. Louis to Reagan-National. 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 24, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$124Average$252FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$170Average$289FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$198Average$304FlexibilityNo cancel feeOn-time63%

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