HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
St. Louis

$94+ Cheap flights from Reagan-National (DCA) to St. Louis (STL)

DCA — STL
Nov 7 — Nov 141
Sat 11/7
Sat 11/14
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Reagan-National to St. Louis with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.
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

Thu 11/52:40 pm -
Nonstop2h 25m
Sat 11/75:30 am -
1 stop5h 45m
Deal found 10/6$241
Tue 11/172:40 pm -
Nonstop2h 25m
Wed 11/181:40 pm -
2 stops7h 15m
Deal found 10/7$246
Tue 11/38:25 am -
Nonstop2h 30m
Tue 11/101:40 pm -
2 stops7h 15m
Deal found 10/4$247
Tue 10/276:10 am -
1 stop4h 39m
Mon 11/27:00 am -
1 stop4h 58m
Deal found 10/7$251
Fri 11/61:00 pm -
1 stop7h 14m
Fri 11/137:59 pm -
1 stop15h 10m
Deal found 10/7$252
Sat 11/141:00 pm -
1 stop7h 14m
Mon 11/166:34 pm -
2 stops21h 13m
Deal found 10/7$254
Tue 11/176:55 pm -
Nonstop2h 35m
Thu 11/197:15 pm -
Nonstop1h 55m
Deal found 10/4$255
Sat 11/148:00 am -
2 stops9h 50m
Thu 11/194:30 pm -
1 stop4h 30m
Deal found 10/6$256
Wed 10/282:25 pm -
Nonstop2h 32m
Fri 10/3010:48 am -
Nonstop2h 11m
Deal found 10/6$257
Mon 11/28:25 am -
Nonstop2h 30m
Mon 11/97:55 pm -
Nonstop1h 55m
Deal found 10/5$258
Thu 11/266:00 am -
2 stops9h 30m
Thu 12/31:40 pm -
2 stops7h 15m
Deal found 10/7$261

Find flight deals from Reagan-National to St. Louis

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$241
(Southwest)

One-way from

$94
(Super.com)

Popular in

August

Cheapest in

January

Average price

$379

Good round-trip deal

$317 or less

Good one-way deal

$162 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. 8% potential increase in price ($38 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2026
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

 
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

Washington, D.C.St. Louis

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

DCASTL

Washington, D.C. Reagan-National

Fri 1/8

2:00 pm-8:51 pm

1 stop7h 51m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$115

Washington, D.C.St. Louis

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

DCASTL

Washington, D.C. Reagan-National

Thu 1/7

11:00 am-3:55 pm

1 stop5h 55m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$115

Washington, D.C.St. Louis

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

DCASTL

Washington, D.C. Reagan-National

Wed 1/6

2:00 pm-8:51 pm

1 stop7h 51m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$115
Quickest round-trip

Washington, D.C.St. Louis

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

DCASTL

Washington, D.C. Reagan-National

Wed 1/6

2:50 pm-4:15 pm

Nonstop2h 25m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$116

Washington, D.C.St. Louis

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

DCASTL

Washington, D.C. Reagan-National

Wed 11/4

6:05 am-1:05 pm

1 stop8h 00m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$126

Washington, D.C.St. Louis

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

DCASTL

Washington, D.C. Reagan-National

Tue 11/24

2:05 pm-7:10 pm

1 stop6h 05m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$126

Washington, D.C.St. Louis

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

DCASTL

Washington, D.C. Reagan-National

Sat 1/9

12:59 pm-4:50 pm

1 stop4h 51m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$126

Washington, D.C.St. Louis

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

DCASTL

Washington, D.C. Reagan-National

Thu 11/19

6:05 am-1:05 pm

1 stop8h 00m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$138

Washington, D.C.St. Louis

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

DCASTL

Washington, D.C. Reagan-National

Mon 11/23

2:40 pm-7:50 pm

1 stop6h 10m

Lambert-St Louis

Wed 12/31

12:00 am-1:00 am

Nonstop0h 00m

$138

Washington, D.C.St. Louis

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

DCASTL

Washington, D.C. Reagan-National

Thu 1/14

8:40 am-12:15 pm

1 stop4h 35m

Lambert-St Louis

Mon 1/18

9:05 am-3:32 pm

1 stop5h 27m

$251

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/6

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

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 October.
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 $313 and $539 in November.
The cheapest round-trip price found within the last 5 days was $241 on Southwest (Nov 5-Nov 7).

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
7.9
Good
4,219 reviews

Comfort

8.0

Crew

8.6

Overall

7.9

Entertainment

7.5

Food

7.0

Boarding

8.1

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
7.9
Good
4,219 reviews
Southwest
7.9
Good
4,219 reviews

Comfort

8.0

Crew

8.6

Overall

7.9

Entertainment

7.5

Food

7.0

Boarding

8.1

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
12,134 reviews
Southwest
7.9
Good
4,219 reviews

Comfort

8.0

Crew

8.6

Overall

7.9

Entertainment

7.5

Food

7.0

Boarding

8.1

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 4 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 $251, United Airlines can have you in St. Louis from Washington, D.C. Reagan-National Airport in 4h 35m. 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 ($231), and Southwest ($237) offers the cheapest pricing from Washington, D.C. Reagan-National Airport to St. Louis. American Airlines is 41% 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 $127 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 (63%), Southwest (50%).

  • 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 $124. While the most popular route (Washington, D.C. Reagan-National - Lambert-St Louis) can be booked for $218 on average, our data indicates $323 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
Chesterfield
Maryland Heights
Collinsville
Edwardsville
Glencoe

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$231Average$385FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$237Average$406FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.