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$89+ Cheap flights from Reagan-National (DCA) to St. Louis (STL)

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 4/16. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — STL
Apr 1 — Apr 81
Tue 4/1
Tue 4/8
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. Reagan-National to Lambert-St Louis are usually found in February or July, booked 74 days in advance, depart on a Wednesday or Monday and return on a Wednesday

Cheap flight deals from Reagan-National to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Reagan-National (DCA) to St. Louis (STL). 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 March 27, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$207
(Southwest)

One-way from

$89
(American Airlines)

Popular in

March

Cheapest in

February

Average price

$375

Good round-trip deal

$277 or less

Good one-way deal

$178 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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High demand for flights, 2% potential price rise
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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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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Find flight deals from Reagan-National to St. Louis

Cheapest flights from Reagan-National to St. Louis
Explore the most affordable flight options available from Reagan-National to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 27, 2025.

This Southwest deal was found by Cheapflights users on 3/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/167:10 pmDCA - STL
1 stop4h 00mSouthwest
Sat 4/261:50 pmSTL - DCA
Nonstop2h 05mSouthwest
Deal found 3/26$207
This American Airlines deal was found by Cheapflights users on 3/26. 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.
Sat 5/108:00 pmDCA - STL
Nonstop2h 42mAmerican Airlines
Sat 5/173:47 pmSTL - DCA
Nonstop1h 58mAmerican Airlines
Deal found 3/26$218
This Delta deal was found by Cheapflights users on 3/26. 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.
Sun 4/276:00 amDCA - STL
1 stop6h 45mDelta
Mon 4/285:32 pmSTL - DCA
1 stop5h 07mDelta
Deal found 3/26$223
This CheapOair deal was found by Cheapflights users on 3/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/46:00 pmDCA - STL
1 stop16h 06mFrontier
Mon 4/76:51 pmSTL - DCA
1 stop16h 13mFrontier
Deal found 3/26$240
This United Airlines deal was found by Cheapflights users on 3/25. 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 4/87:25 amDCA - STL
1 stop5h 55mUnited Airlines
Tue 4/153:40 pmSTL - DCA
1 stop4h 25mUnited Airlines
Deal found 3/25$363

Cheapflights Fare Finder

Customize your flight search to find flights from Reagan-National to St. Louis 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 March 27, 2025.
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

Reagan-National

Fly to

St. Louis

Route

Depart

Return

Price

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Wed 4/16

7:10 pm-10:10 pm

1 stop4h 00m

Lambert-St Louis

Sat 4/26

1:50 pm-4:55 pm

Nonstop2h 05m

$207

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 5/10

8:00 pm-9:42 pm

Nonstop2h 42m

Lambert-St Louis

Sat 5/17

3:47 pm-6:45 pm

Nonstop1h 58m

$218

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sun 4/27

6:00 am-11:45 am

1 stop6h 45m

Lambert-St Louis

Mon 4/28

5:32 pm-11:39 pm

1 stop5h 07m

$223

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Fri 4/18

7:00 am-9:06 am

1 stop27h 06m

Lambert-St Louis

Mon 4/21

6:51 pm-12:09 pm

1 stop16h 18m

$247

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 4/8

7:25 am-12:20 pm

1 stop5h 55m

Lambert-St Louis

Tue 4/15

3:40 pm-9:05 pm

1 stop4h 25m

$363

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 4/15

8:00 am-11:59 pm

1 stop16h 59m

Lambert-St Louis

Mon 4/21

3:11 pm-4:38 pm

1 stop24h 27m

$882

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 4/21

3:00 pm-4:15 pm

Nonstop2h 15m

$89

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sun 4/20

8:22 am-9:52 am

Nonstop2h 30m

$90

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 4/21

6:28 pm-11:36 pm

1 stop6h 08m

$99

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 7/22

12:00 pm-3:47 pm

1 stop4h 47m

$125

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Showing 1-10 of 12 results
1
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Compare providers for flights from Reagan-National to St. Louis

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 Reagan-National to St. Louis in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
Justfly.comPrice 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.

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

DCA has a dedicated Metro stop on the Yellow and Blue lines, offering a clean and affordable way to reach the airport.

Read more about DCAby Emily Zemler
STL

The MetroLink light rail offers a convenient and economical option to reach downtown St. Louis from STL in about 40 minutes.

Read more about STLby Taryn White
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

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
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 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?

Use this chart to determine the optimal time to book a round-trip flight from Reagan-National to St. Louis. Price data was last updated on March 21, 2025.

The best time to book flights from Washington, D.C. Reagan-National Airport to St. Louis is 74 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, August is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to St. Louis (average of $311). Flying from Washington, D.C. Reagan-National Airport to St. Louis in March is currently the most expensive (average of $356). 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?

Find hourly flight availability from Reagan-National to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 27, 2025.

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 17% on the cost of your flight, compared to a flight in the morning.

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

Use this chart to determine the cheapest time to fly round-trip from Reagan-National to St. Louis. Price data was last updated on March 23, 2025.

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

Weekly flight availability from Washington, D.C. Reagan-National Airport to St. Louis

Explore weekly flight availability from Reagan-National to St. Louis. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated March 27, 2025.

The most flights from DCA to STL are scheduled on a Thursday (7 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (1 on average).

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated March 27, 2025.
Read through reviews of airlines operating flights from Washington, D.C. to St. Louis, such as Southwest, Alaska Airlines and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,273 reviews

Entertainment

7.6

Food

7.1

Crew

8.6

Comfort

8.1

Overall

8.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.1
Very good
4,273 reviews
Southwest
8.1
Very good
4,273 reviews

Entertainment

7.6

Food

7.1

Crew

8.6

Comfort

8.1

Overall

8.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Alaska Airlines
8.0
Very good
9,795 reviews
Southwest
8.1
Very good
4,273 reviews

Entertainment

7.6

Food

7.1

Crew

8.6

Comfort

8.1

Overall

8.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very good
7,895 reviews
Southwest
8.1
Very good
4,273 reviews

Entertainment

7.6

Food

7.1

Crew

8.6

Comfort

8.1

Overall

8.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,603 reviews
Southwest
8.1
Very good
4,273 reviews

Entertainment

7.6

Food

7.1

Crew

8.6

Comfort

8.1

Overall

8.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,273 reviews

Entertainment

7.6

Food

7.1

Crew

8.6

Comfort

8.1

Overall

8.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Related info for your journey

Find useful and relevant information for your journey from Reagan-National to St. Louis. 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 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 4 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.

  • What are the cheapest airlines flying from Washington, D.C. Reagan-National Airport to St. Louis round-trip?

    According to our current data, Southwest ($207), American Airlines ($218), and Delta ($243) offers the cheapest pricing from Washington, D.C. Reagan-National Airport to St. Louis. Southwest is 36% 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 American Airlines, which is currently one of the cheapest options available, starting at $89. Southwest flights start at $94 while deals on Delta start at $99 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 (81%), Southwest (80%), American Airlines (57%).

  • 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 $109. While the most popular route (Washington, D.C. Reagan-National - Lambert-St Louis) can be booked for $177 on average our data indicates $302 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, August is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to St. Louis (average of $311). Flying from Washington, D.C. Reagan-National Airport to St. Louis in March is currently the most expensive (average of $356). 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
Fenton
Fairview Heights
Maryland Heights
Collinsville
Wentzville
Eureka
St. Peters
Festus
Glencoe
Alton
Farmington
Chesterfield

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Alternative routes for Reagan-National to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Reagan-National to St. Louis

Discover the top 4 airlines that operate flights from Reagan-National to St. Louis. 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 March 27, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$188Average$326FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$200Average$335FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$223Average$322FlexibilityNo cancel feeOn-time69%
DeltaCheapest$238Average$363FlexibilityNo cancel feeOn-timeN/A
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