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St. Louis

$98+ Cheap flights from Reagan-National (DCA) to St. Louis (STL)

DCA — STL
Oct 26 — Nov 21
Mon 10/26
Mon 11/2
1 adult, Economy
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Find cheap flights from Reagan-National to St. Louis with Cheapflights

1. Tell us where you want to go

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3. Compare prices and book

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Cheapflights Tip: The best prices from Washington, D.C. Reagan-National to Lambert-St Louis are usually found in January or February, booked 48 days in advance, depart on a Wednesday or Thursday and return on a Saturday

Cheap flight deals from Reagan-National to St. Louis

Cheapest flights from Reagan-National to St. Louis

Tue 10/203:05 pm -
Nonstop2h 25m
Tue 10/2710:20 am -
1 stop3h 10m
Deal found 9/22$243
Sat 10/171:00 pm -
1 stop6h 57m
Mon 10/196:35 pm -
2 stops40h 29m
Deal found 9/26$244
Wed 10/212:25 pm -
Nonstop2h 32m
Thu 10/225:00 am -
1 stop7h 26m
Deal found 9/22$247
Fri 10/161:00 pm -
1 stop7h 15m
Mon 10/198:00 pm -
1 stop19h 56m
Deal found 9/22$248
Mon 11/97:00 am -
1 stop13h 14m
Thu 11/1911:40 am -
1 stop9h 10m
Deal found 9/24$256
Wed 10/219:40 am -
1 stop5h 13m
Tue 10/2712:00 pm -
1 stop4h 26m
Deal found 9/23$257
Wed 10/288:26 am -
Nonstop2h 52m
Fri 10/3010:48 am -
Nonstop2h 11m
Deal found 9/22$266
Fri 10/236:00 pm -
1 stop25h 57m
Fri 10/307:59 pm -
1 stop15h 10m
Deal found 9/23$273
Wed 10/286:40 pm -
Nonstop2h 30m
Fri 10/308:30 am -
1 stop5h 30m
Deal found 9/23$276
Thu 11/1212:00 pm -
2 stops8h 10m
Fri 11/137:55 pm -
Nonstop1h 55m
Deal found 9/21$281

Find flight deals from Reagan-National to St. Louis

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$243
(Southwest)

One-way from

$98
(Super.com)

Popular in

August

Cheapest in

January

Average price

$377

Good round-trip deal

$307 or less

Good one-way deal

$186 or less
Provider with most accurate pricing for Washington, D.C. Reagan-National-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. Reagan-National-Lambert-St Louis flights.
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From Washington, D.C. Reagan-National to Lambert-St Louis
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One-way flight from Washington, D.C. Reagan-National to Lambert-St Louis
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Highest demand for flights based on searches. 7% potential increase in price ($33 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in September 2026
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Price to beat on a round-trip flight from Washington, D.C. Reagan-National to Lambert-St Louis.
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Price to beat on a one-way flight from Washington, D.C. Reagan-National to Lambert-St Louis.
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Cheapflights Fare Finder

 
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

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

Washington, D.C.St. Louis

DCA Washington, D.C. Reagan-National - STL Lambert-St Louis

DCASTL

Washington, D.C. Reagan-National

Thu 10/22

12:00 pm-1:25 pm

Nonstop2h 25m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$119

Washington, D.C.St. Louis

DCA Washington, D.C. Reagan-National - STL Lambert-St Louis

DCASTL

Washington, D.C. Reagan-National

Sat 10/17

8:15 am-9:40 am

Nonstop2h 25m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$119

Washington, D.C.St. Louis

DCA Washington, D.C. Reagan-National - STL Lambert-St Louis

DCASTL

Washington, D.C. Reagan-National

Thu 11/26

10:15 am-4:23 pm

1 stop7h 08m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$129

Washington, D.C.St. Louis

DCA Washington, D.C. Reagan-National - STL Lambert-St Louis

DCASTL

Washington, D.C. Reagan-National

Fri 12/25

9:30 am-2:18 pm

1 stop5h 48m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$158

Washington, D.C.St. Louis

DCA Washington, D.C. Reagan-National - STL Lambert-St Louis

DCASTL

Washington, D.C. Reagan-National

Wed 12/23

8:25 am-9:55 am

Nonstop2h 30m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$168

Washington, D.C.St. Louis

DCA Washington, D.C. Reagan-National - STL Lambert-St Louis

DCASTL

Washington, D.C. Reagan-National

Mon 11/9

2:50 pm-9:00 pm

2 stops7h 10m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$183

Washington, D.C.St. Louis

DCA Washington, D.C. Reagan-National - STL Lambert-St Louis

DCASTL

Washington, D.C. Reagan-National

Wed 12/23

8:15 pm-11:55 pm

1 stop4h 40m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$193

Washington, D.C.St. Louis

DCA Washington, D.C. Reagan-National - STL Lambert-St Louis

DCASTL

Washington, D.C. Reagan-National

Mon 12/21

3:05 pm-10:30 pm

2 stops8h 25m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$194

Washington, D.C.St. Louis

DCA Washington, D.C. Reagan-National - STL Lambert-St Louis

DCASTL

Washington, D.C. Reagan-National

Wed 12/23

6:00 am-1:00 pm

1 stop8h 00m

Lambert-St Louis

Thu 12/31

7:15 pm-10:10 pm

Nonstop1h 55m

$247

Washington, D.C.St. Louis

DCA Washington, D.C. Reagan-National - STL Lambert-St Louis

DCASTL

Washington, D.C. Reagan-National

Tue 10/27

12:20 pm-1:45 pm

Nonstop2h 25m

Lambert-St Louis

Tue 10/27

3:35 pm-11:55 pm

2 stops7h 20m

$252

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/23

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

Compare providers for flights from Reagan-National to St. Louis

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 September.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice 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 Washington, D.C. Reagan-National Airport-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Reagan-National Airport-St. Louis flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C. 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

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?

The best time to book flights from Washington, D.C. Reagan-National Airport to St. Louis is 47 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, January is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to St. Louis (average of $309). Flying from Washington, D.C. Reagan-National Airport to St. Louis in August is currently the most expensive (average of $482). 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?

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 8% on the cost of your flight, compared to a flight in the evening.

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

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

How much does it cost to fly round-trip from Washington, D.C. Reagan-National Airport to St. Louis?

Airfare is below average for this route at the moment.

Washington, D.C. Reagan-National Airport to St. Louis flights typically cost between $311 and $599 in October.
The cheapest round-trip price found within the last 5 days was $243 on Southwest (Oct 20-Oct 27).

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

Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. Reagan-National Airport to St. Louis trip
Our travel experts
Emily Zemler

Emily Zemler

Expert on DCA

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 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

Peruse reviews from past customers who have flown with Southwest and American 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
4,202 reviews

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Courtney,Sep 2026

DEN - STL

I still think the aircraft should load from the back and window seats first for all passengers. It's so much easier and efficient to board when you do not have to worry about hitting Anyone already seated.
Southwest
8.0
Very good
4,202 reviews
Southwest
8.0
Very good
4,202 reviews

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Courtney,Sep 2026

DEN - STL

I still think the aircraft should load from the back and window seats first for all passengers. It's so much easier and efficient to board when you do not have to worry about hitting Anyone already seated.
American Airlines
7.0
Good
12,097 reviews
Southwest
8.0
Very good
4,202 reviews

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Courtney,Sep 2026

DEN - STL

I still think the aircraft should load from the back and window seats first for all passengers. It's so much easier and efficient to board when you do not have to worry about hitting Anyone already seated.

Related info for your journey

  • 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 3 inbound flights from Washington, D.C. Reagan-National per day. You should also have plenty of airline options to choose from since 2 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 $257, Southwest can have you in St. Louis from Washington, D.C. Reagan-National Airport in 4h 52m. 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 ($217), and Southwest ($236) offers the cheapest pricing from Washington, D.C. Reagan-National Airport to St. Louis. American Airlines is 46% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Washington, D.C. Reagan-National Airport to St. Louis one-way?

    To fly one-way, consider booking your trip with United Airlines, which is currently one of the cheapest options available, starting at $100. Southwest flights start at $118 while deals on American Airlines start at $129 one-way.

  • 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: Republic Airways (89%), American Airlines (74%), Southwest (55%).

  • 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 $212 on average, our data indicates $314 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, January is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to St. Louis (average of $309). Flying from Washington, D.C. Reagan-National Airport to St. Louis in August is currently the most expensive (average of $482). 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
Fairview Heights
O'Fallon
Fenton
Swansea
Eureka
Wentzville
Maryland Heights
Collinsville
Edwardsville
Glencoe
Chesterfield

Browse thousands of different options on Cheapflights for your next trip

Top 2 airlines flying from Reagan-National to St. Louis

AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$217Average$390FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$236Average$408FlexibilityNo cancel feeOn-time63%

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