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Reagan-National

$64+ 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 1/26. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DCA
Jan 3 — Jan 101
Sat 1/3
Sat 1/10
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 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

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 December 4, 2025.

This Mytrip deal was found by Cheapflights users on 12/2. 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.
Wed 12/247:43 pmSTL - DCA
1 stop25h 16mFrontier
Sun 1/48:00 amDCA - STL
1 stop27h 02mFrontier
Deal found 12/2$217
This Mytrip deal was found by Cheapflights users on 12/2. 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.
Wed 12/107:43 pmSTL - DCA
1 stop16h 23mFrontier
Thu 12/116:00 pmDCA - STL
1 stop17h 14mFrontier
Deal found 12/2$222
This Booking.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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/127:43 pmSTL - DCA
1 stop20h 16mFrontier
Sun 12/148:00 amDCA - STL
1 stop27h 14mFrontier
Deal found 12/1$225
This Gotogate deal was found by Cheapflights users on 12/3. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/87:43 pmSTL - DCA
1 stop16h 23mFrontier
Fri 12/126:00 pmDCA - STL
1 stop17h 14mFrontier
Deal found 12/3$247
This Booking.com deal was found by Cheapflights users on 12/2. 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.
Mon 12/227:43 pmSTL - DCA
1 stop25h 16mFrontier
Sun 1/48:00 amDCA - STL
1 stop27h 02mFrontier
Deal found 12/2$257
This American Airlines deal was found by Cheapflights users on 12/2. 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 12/306:02 amSTL - DCA
Nonstop2h 08mAmerican Airlines
Tue 1/67:40 amDCA - STL
Nonstop2h 44mAmerican Airlines
Deal found 12/2$258
This Mytrip deal was found by Cheapflights users on 12/2. 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 12/157:43 pmSTL - DCA
1 stop16h 23mFrontier
Thu 12/188:00 amDCA - STL
1 stop27h 02mFrontier
Deal found 12/2$272
This Trip.com deal was found by Cheapflights users on 12/4. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/177:43 pmSTL - DCA
1 stop25h 16mFrontier
Thu 1/16:00 pmDCA - STL
1 stop17h 02mFrontier
Deal found 12/4$279
This Kiwi.com deal was found by Cheapflights users on 12/2. 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 12/304:27 pmSTL - DCA
2 stops43h 34mFrontier
Tue 1/62:00 pmDCA - STL
1 stop21h 02mFrontier
Deal found 12/2$282
This Delta deal was found by Cheapflights users on 12/2. 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.
Wed 12/245:55 pmSTL - DCA
1 stop3h 55mDelta
Thu 12/252:01 pmDCA - STL
1 stop6h 03mDelta
Deal found 12/2$283

Find 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 December 4, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$213
(American Airlines)

One-way from

$64
(Priceline)

Popular in

November

Cheapest in

August

Average price

$311

Good round-trip deal

$304 or less

Good one-way deal

$173 or less
Provider with most accurate pricing for Lambert-St Louis-Washington, D.C. Reagan-National flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Washington, D.C. Reagan-National flights.
Search Deals
From Lambert-St Louis to Washington, D.C. Reagan-National
Search Deals
One-way flight from Lambert-St Louis to Washington, D.C. Reagan-National
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($38 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($11 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 Lambert-St Louis to Washington, D.C. Reagan-National.
Search Deals
Price to beat on a one-way flight from Lambert-St Louis to Washington, D.C. Reagan-National.
Search Deals

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 December 4, 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

Thu 2/12

7:41 am-1:07 pm

1 stop4h 26m

Washington, D.C. Reagan-National

Fri 2/13

5:00 pm-9:00 pm

1 stop5h 00m

$222

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 1/13

10:15 am-6:00 pm

2 stops6h 45m

Washington, D.C. Reagan-National

Sun 1/18

6:00 am-11:45 am

1 stop6h 45m

$223

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 2/12

7:35 pm-10:30 pm

Nonstop1h 55m

Washington, D.C. Reagan-National

Fri 2/13

6:00 am-9:15 am

1 stop4h 15m

$241

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 1/10

7:40 am-4:15 pm

2 stops7h 35m

Washington, D.C. Reagan-National

Mon 1/12

11:45 am-7:00 pm

1 stop8h 15m

$243

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 1/22

6:00 am-2:15 pm

2 stops7h 15m

Washington, D.C. Reagan-National

Sat 1/24

12:45 pm-8:10 pm

2 stops8h 25m

$248

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 1/6

9:59 am-5:00 pm

1 stop6h 01m

Washington, D.C. Reagan-National

Thu 1/8

1:40 pm-5:50 pm

1 stop5h 10m

$251

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 1/13

10:15 am-6:00 pm

2 stops6h 45m

Washington, D.C. Reagan-National

Thu 1/15

10:45 am-5:55 pm

2 stops8h 10m

$258

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Mon 1/12

3:45 pm-9:34 pm

1 stop4h 49m

Washington, D.C. Reagan-National

Thu 1/15

6:00 am-12:33 pm

1 stop7h 33m

$259

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 12/24

5:55 pm-10:50 pm

1 stop3h 55m

Washington, D.C. Reagan-National

Thu 12/25

2:01 pm-7:04 pm

1 stop6h 03m

$283

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 1/1

4:58 pm-8:08 pm

Nonstop2h 10m

Washington, D.C. Reagan-National

Thu 1/8

6:00 am-1:03 pm

1 stop8h 03m

$284

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/4

Showing 1-10 of 19 results
1
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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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Washington, D.C. Reagan-National Airport flight deals on Cheapflights vs. eDreams >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 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 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 November 28, 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 December 4, 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 16% 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

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 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 December 4, 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
4,252 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

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
4,252 reviews
Southwest
8.0
Very good
4,252 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

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
11,043 reviews
Southwest
8.0
Very good
4,252 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

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
3,092 reviews
Southwest
8.0
Very good
4,252 reviews

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Entertainment

7.5

Overall

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 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 United Airlines and Southwest fly from St. Louis to Washington, D.C. Reagan-National Airport in about 4h 26m. The time it takes to get you to your destination can typically vary by up to 2h 19m. 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 ($177), and Southwest ($197) 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: PSA Airlines (83%), Republic Airways (82%), Southwest( 80%).

  • 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 $306, our data shows the cheapest flight currently is $131. When looking at the most popular route, (Lambert-St Louis - Washington, D.C. Reagan-National), you can expect to pay $139 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
Owings Mills
Springfield
Hanover
Silver Spring
Fredericksburg
Fairfax
Linthicum Heights
Manassas
Laurel
Towson
National Harbor
Bowie
Largo
McLean
Clinton
Cordova

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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 December 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$124Average$250FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$177Average$294FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$197Average$304FlexibilityNo cancel feeOn-time63%

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