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Reagan-National

$61+ 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 12/15. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DCA
Dec 6 — Dec 131
Sat 12/6
Sat 12/13
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 November 6, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$181
(Kiwi.com)

One-way from

$61
(Booking.com)

Popular in

October

Cheapest in

August

Average price

$324

Good round-trip deal

$313 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. 7% potential increase in price ($22 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in November 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 November 6, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/1512:07 pmSTL - DCA
2 stops23h 59mFrontier
Tue 1/132:00 pmDCA - STL
1 stop21h 04mFrontier
Deal found 11/5$181
This Booking.com deal was found by Cheapflights users on 11/4. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/137:45 pmSTL - DCA
1 stop16h 17mFrontier
Sat 11/152:00 pmDCA - STL
1 stop20h 07mFrontier
Deal found 11/4$192
This Trip.com deal was found by Cheapflights users on 11/6. 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.
Mon 11/177:45 pmSTL - DCA
1 stop25h 14mFrontier
Wed 11/192:00 pmDCA - STL
1 stop29h 58mFrontier
Deal found 11/6$213
This American Airlines deal was found by Cheapflights users on 11/5. 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 12/99:53 amSTL - DCA
Nonstop2h 04mAmerican Airlines
Thu 12/117:59 pmDCA - STL
Nonstop2h 48mAmerican Airlines
Deal found 11/5$217
This Booking.com deal was found by Cheapflights users on 11/6. 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.
Wed 11/127:45 pmSTL - DCA
1 stop16h 17mFrontier
Wed 11/192:00 pmDCA - STL
1 stop29h 58mFrontier
Deal found 11/6$222
This Flightnetwork deal was found by Cheapflights users on 11/4. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/157:45 pmSTL - DCA
1 stop16h 17mFrontier
Mon 11/176:00 pmDCA - STL
1 stop16h 07mFrontier
Deal found 11/4$223
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/23:30 pmSTL - DCA
2 stops48h 29mFrontier
Tue 12/98:00 amDCA - STL
1 stop27h 14mFrontier
Deal found 11/4$225
This Mytrip deal was found by Cheapflights users on 11/4. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/17:43 pmSTL - DCA
1 stop16h 23mFrontier
Thu 12/46:00 pmDCA - STL
1 stop17h 14mFrontier
Deal found 11/4$233
This United Airlines deal was found by Cheapflights users on 11/5. 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.
Tue 12/96:30 amSTL - DCA
1 stop6h 43mUnited Airlines
Thu 12/1112:00 pmDCA - STL
1 stop4h 40mUnited Airlines
Deal found 11/5$237
This American Airlines deal was found by Cheapflights users on 11/4. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/22:11 pmSTL - DCA
Nonstop2h 08mAmerican Airlines
Tue 12/97:50 amDCA - STL
Nonstop2h 33mAmerican Airlines
Deal found 11/4$240
This Kiwi.com deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/812:07 pmSTL - DCA
2 stops23h 59mFrontier
Thu 12/116:00 pmDCA - STL
1 stop17h 14mFrontier
Deal found 11/6$242
This American Airlines deal was found by Cheapflights users on 11/6. 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 12/86:00 pmSTL - DCA
Nonstop2h 15mAmerican Airlines
Wed 12/103:14 pmDCA - STL
Nonstop2h 45mAmerican Airlines
Deal found 11/6$245

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 November 6, 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

Tue 12/16

4:32 pm-10:57 pm

1 stop5h 25m

Washington, D.C. Reagan-National

Thu 1/1

6:00 am-9:24 am

1 stop4h 24m

$260

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 12/6

8:45 am-11:40 am

Nonstop1h 55m

Washington, D.C. Reagan-National

Mon 12/8

6:10 pm-7:35 pm

Nonstop2h 25m

$268

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Mon 12/15

6:05 pm-11:08 pm

1 stop4h 03m

Washington, D.C. Reagan-National

Thu 1/1

6:00 am-9:24 am

1 stop4h 24m

$288

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 12/24

10:04 am-4:40 pm

1 stop5h 36m

Washington, D.C. Reagan-National

Mon 1/5

7:30 pm-11:39 pm

1 stop5h 09m

$288

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Mon 12/15

10:15 am-6:20 pm

1 stop7h 05m

Washington, D.C. Reagan-National

Tue 1/13

12:00 pm-1:35 pm

Nonstop2h 35m

$291

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Fri 12/5

8:45 am-11:40 am

Nonstop1h 55m

Washington, D.C. Reagan-National

Mon 12/8

12:25 pm-1:45 pm

Nonstop2h 20m

$301

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 12/24

6:00 am-11:37 am

1 stop4h 37m

Washington, D.C. Reagan-National

Sun 1/4

8:11 pm-11:42 pm

1 stop4h 31m

$309

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 1/7

6:00 am-2:15 pm

2 stops7h 15m

Washington, D.C. Reagan-National

Thu 1/8

11:00 am-5:05 pm

2 stops7h 05m

$311

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 12/4

5:45 am-3:05 pm

2 stops8h 20m

Washington, D.C. Reagan-National

Thu 12/4

6:55 pm-10:10 pm

1 stop4h 15m

$311

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 12/6

7:43 pm-1:06 pm

1 stop16h 23m

$101

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/3

Showing 1-10 of 19 results
1
2

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 November.
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 October 31, 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 November 6, 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 13% 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 November 6, 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
4,240 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

Boarding

8.1

Overall

8.0

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
4,240 reviews
Southwest
8.0
Very good
4,240 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

Boarding

8.1

Overall

8.0

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
11,041 reviews
Southwest
8.0
Very good
4,240 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

Boarding

8.1

Overall

8.0

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
3,116 reviews
Southwest
8.0
Very good
4,240 reviews

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

Boarding

8.1

Overall

8.0

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 7 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 Delta and Southwest fly from St. Louis to Washington, D.C. Reagan-National Airport in about 1h 55m. The time it takes to get you to your destination can typically vary by up to 3h 30m. 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 ($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 cheapest airlines to fly from St. Louis to Washington, D.C. Reagan-National Airport one-way?

    $101 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Southwest and United Airlines, with prices starting from $109 and $119, respectively.

  • 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 (80%), PSA Airlines (78%), American Airlines( 78%).

  • 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 $395, 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 $220 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
Tysons
Woodbridge
Arlington
Owings Mills
Springfield
Hanover
Silver Spring
Fairfax
Fredericksburg
Falls Church
Linthicum Heights
Manassas
Laurel
Towson
National Harbor
Waldorf
Bowie
Largo
McLean

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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 November 6, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$124Average$238FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$177Average$295FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$198Average$307FlexibilityNo cancel feeOn-time63%

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