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

According to our current data, Frontier ($208), American Airlines ($213), and Southwest ($214) offers the cheapest pricing from St. Louis to Washington, D.C. Reagan-National Airport. Frontier is priced at 28% 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?

$96 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 Delta, with prices starting from $100 and $109, respectively.

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 $280, our data shows the cheapest flight currently is $99. When looking at the most popular route, (Lambert-St Louis - Washington, D.C. Reagan-National), you can expect to pay $204 for that flight.

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 (73%), American Airlines (68%), Southwest( 61%).

What are the most popular airlines that fly from St. Louis to Washington, D.C. Reagan-National Airport?

The most popular airlines flying from St. Louis to Washington, D.C. Reagan-National Airport are American Airlines, United Airlines and Southwest. Something to consider prior to booking your flight.

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

Users have found that leaving on a Friday can be a cost-effective option. It’s possible to save up to 36% on your flight compared to booking on days when demand is much higher.

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

November can be a great time to fly to Washington, D.C. Reagan-National Airport from St. Louis with a flight ticket averaging about $298. Cheapflights users have found deals in the month of November for as cheap as $137. The most expensive prices can be found in the month of March.

Most accurate provider : When it comes to deals on St. Louis-Washington, D.C. Reagan-National Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Washington, D.C. Reagan-National Airport flight deals on Cheapflights vs. FlightHub >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.

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.

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.

$96+ Flights from St. Louis to Washington, D.C. Reagan-National Airport

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

Find cheap flights from St. Louis to Reagan-National 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 Lambert-St Louis to Washington, D.C. Reagan-National are usually found in August or September, booked 37 days in advance, depart on a Saturday or Wednesday and return on a Monday

Cheap flight deals from St. Louis to Reagan-National

Most accurate provider	FlightHub 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$208 (Booking.com)
One-way from	$96 (Mytrip)
Popular in	October
Cheapest in	August
Average price	$311
Good round-trip deal	$245 or less
Good one-way deal	$141 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. 4% potential increase in price ($12 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 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

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 April 15, 2025.

Thu 5/14:07 pmSTL - DCA

1 stop19h 00mFrontier

Sun 5/47:00 amDCA - STL

1 stop27h 09mFrontier

Deal found 4/13

$208

Sat 5/243:47 pmSTL - DCA

Nonstop1h 58mAmerican Airlines

Sun 5/251:54 pmDCA - STL

Nonstop2h 17mAmerican Airlines

Deal found 4/14

$213

Wed 5/213:35 pmSTL - DCA

Nonstop2h 00mSouthwest

Sat 5/242:25 pmDCA - STL

1 stop6h 35mSouthwest

Deal found 4/14

$214

Thu 5/292:15 pmSTL - DCA

1 stop3h 44mDelta

Mon 6/27:33 pmDCA - STL

1 stop5h 05mDelta

Deal found 4/13

$233

Fri 4/2510:40 amSTL - DCA

1 stop5h 20mUnited Airlines

Wed 5/2110:30 amDCA - STL

1 stop5h 17mUnited Airlines

Deal found 4/14

$399

Mon 6/307:32 pmSTL - DCA

1 stop25h 27mAlaska Airlines

Fri 7/45:02 pmDCA - STL

2 stops16h 11mAlaska Airlines

Deal found 4/14

$928

Best flights from St. Louis to Reagan-National
Discover carefully curated flight deals from St. Louis to Reagan-National that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 15, 2025.

Thu 5/14:07 pmSTL - DCA

1 stop19h 00mFrontier

Sun 5/47:00 amDCA - STL

1 stop27h 09mFrontier

Deal found 4/13

$208

Sat 5/243:47 pmSTL - DCA

Nonstop1h 58mAmerican Airlines

Sun 5/251:54 pmDCA - STL

Nonstop2h 17mAmerican Airlines

Deal found 4/14

$213

Wed 5/213:35 pmSTL - DCA

Nonstop2h 00mSouthwest

Sat 5/242:25 pmDCA - STL

1 stop6h 35mSouthwest

Deal found 4/14

$214

Thu 5/292:15 pmSTL - DCA

1 stop3h 44mDelta

Mon 6/27:33 pmDCA - STL

1 stop5h 05mDelta

Deal found 4/13

$233

Fri 4/2510:40 amSTL - DCA

1 stop5h 20mUnited Airlines

Wed 5/2110:30 amDCA - STL

1 stop5h 17mUnited Airlines

Deal found 4/14

$399

Mon 6/307:32 pmSTL - DCA

1 stop25h 27mAlaska Airlines

Fri 7/45:02 pmDCA - STL

2 stops16h 11mAlaska Airlines

Deal found 4/14

$928

Last-minute flights from St. Louis to Reagan-National
Discover last-minute flight deals from St. Louis to Reagan-National. Data last updated April 15, 2025 and is based on user searches.

Mon 4/216:51 pmSTL - DCA

1 stop26h 08mFrontier

Fri 4/256:00 pmDCA - STL

1 stop17h 01mFrontier

Deal found 4/14

$242

Mon 4/215:20 pmSTL - DCA

1 stop4h 35mSouthwest

Mon 4/2811:35 amDCA - STL

1 stop7h 25mSouthwest

Deal found 4/13

$504

Fri 4/2510:48 amSTL - DCA

Nonstop2h 02mAmerican Airlines

Wed 5/211:54 pmDCA - STL

Nonstop2h 17mAmerican Airlines

Deal found 4/14

$379

Fri 4/2510:40 amSTL - DCA

1 stop5h 20mUnited Airlines

Wed 5/2110:30 amDCA - STL

1 stop5h 17mUnited Airlines

Deal found 4/14

$399

Fri 4/256:50 amSTL - DCA

1 stop3h 48mDelta

Sun 4/279:41 amDCA - STL

1 stop4h 20mDelta

Deal found 4/14

$509

Thu 5/14:07 pmSTL - DCA

1 stop19h 00mFrontier

Sun 5/47:00 amDCA - STL

1 stop27h 09mFrontier

Deal found 4/13

$208

Wed 5/213:35 pmSTL - DCA

Nonstop2h 00mSouthwest

Sat 5/242:25 pmDCA - STL

1 stop6h 35mSouthwest

Deal found 4/14

$214

Sat 5/243:47 pmSTL - DCA

Nonstop1h 58mAmerican Airlines

Sun 5/251:54 pmDCA - STL

Nonstop2h 17mAmerican Airlines

Deal found 4/14

$213

Thu 5/292:15 pmSTL - DCA

1 stop3h 44mDelta

Mon 6/27:33 pmDCA - STL

1 stop5h 05mDelta

Deal found 4/13

$233

One-way flights from St. Louis to Reagan-National
Search for one-way flight options from St. Louis to Reagan-National. Find affordable one-way fares based on user searches. Data last updated April 15, 2025.

Wed 4/236:58 pmSTL - DCA

1 stop16h 11mFrontier

Deal found 4/14

$96

Sun 5/257:00 amSTL - DCA

1 stop6h 50mSouthwest

Deal found 4/14

$100

Sun 4/206:50 amSTL - DCA

1 stop3h 48mDelta

Deal found 4/14

$109

Sun 7/65:26 amSTL - DCA

1 stop4h 33mAmerican Airlines

Deal found 4/14

$149

Mon 5/129:40 amSTL - DCA

1 stop7h 21mUnited Airlines

Deal found 4/15

$160

Cheapflights Fare Finder

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

Fly to

Route

Depart

Return

Price

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 5/1

4:07 pm-12:07 pm

1 stop19h 00m

Washington, D.C. Reagan-National

Sun 5/4

7:00 am-9:09 am

1 stop27h 09m

$208

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 5/24

3:47 pm-6:45 pm

Nonstop1h 58m

Washington, D.C. Reagan-National

Sun 5/25

1:54 pm-3:11 pm

Nonstop2h 17m

$213

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 5/21

3:35 pm-6:35 pm

Nonstop2h 00m

Washington, D.C. Reagan-National

Sat 5/24

2:25 pm-8:00 pm

1 stop6h 35m

$214

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 5/29

2:15 pm-6:59 pm

1 stop3h 44m

Washington, D.C. Reagan-National

Mon 6/2

7:33 pm-11:38 pm

1 stop5h 05m

$233

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Fri 4/25

10:40 am-5:00 pm

1 stop5h 20m

Washington, D.C. Reagan-National

Wed 5/21

10:30 am-2:47 pm

1 stop5h 17m

$399

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Mon 6/30

7:32 pm-9:59 pm

1 stop25h 27m

Washington, D.C. Reagan-National

Fri 7/4

5:02 pm-8:13 am

2 stops16h 11m

$928

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 4/23

6:58 pm-12:09 pm

1 stop16h 11m

$96

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sun 5/25

7:00 am-2:50 pm

1 stop6h 50m

$100

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sun 4/20

6:50 am-11:38 am

1 stop3h 48m

$109

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sun 7/6

5:26 am-10:59 am

1 stop4h 33m

$149

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/14

Showing 1-10 of 11 results

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

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 April.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*2 stars
eDreams	Price Accuracy3 stars	Trust 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Washington, D.C. Reagan-National Airport flight deals on Cheapflights vs. FlightHub >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.

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

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 real-time wait times online during peak hours.

DCA

Use the Metro for affordable and easy access from DCA to downtown D.C. It's clean and convenient for travelers.

Our travel experts

Emily Zemler

Expert on DCA

Taryn White

Expert on STL

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?

The best time to book flights from St. Louis to Washington, D.C. Reagan-National Airport is 37 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, February is the cheapest month in which you can book a flight from St. Louis to Washington, D.C. Reagan-National Airport (average of $278). Flying from St. Louis to Washington, D.C. Reagan-National Airport in June is currently the most expensive (average of $345). 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?

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 14% on the cost of your flight, compared to a flight in the afternoon.

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

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

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

The most flights from STL to DCA are scheduled on a Monday (7 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).

Rainfall in Reagan-National by month

In terms of precipitation, rainfall in Washington, D.C. Reagan-National Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Reagan-National Airport when rainfall is around 2.6 in.

Temperature in Reagan-National by month

If weather is an important factor for your trip to Washington, D.C. Reagan-National Airport, 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 35.6 F).

Reviews of airlines servicing Reagan-National

See what other customers who have flown with Alaska Airlines, Southwest and Delta from St. Louis to Washington, D.C. have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

9,871 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Alaska Airlines

8.0

Very good

9,871 reviews

Alaska Airlines

8.0

Very good

9,871 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Southwest

8.0

Very good

4,279 reviews

Alaska Airlines

8.0

Very good

9,871 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Delta

8.0

Very good

7,918 reviews

Alaska Airlines

8.0

Very good

9,871 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

United Airlines

7.4

Good

8,658 reviews

Alaska Airlines

8.0

Very good

9,871 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

American Airlines

7.2

Good

10,000 reviews

Alaska Airlines

8.0

Very good

9,871 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Related info for your journey

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.
What are the cheapest airlines flying from St. Louis to Washington, D.C. Reagan-National Airport round-trip?
According to our current data, Frontier ($208), American Airlines ($213), and Southwest ($214) offers the cheapest pricing from St. Louis to Washington, D.C. Reagan-National Airport. Frontier is priced at 28% 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?
$96 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 Delta, with prices starting from $100 and $109, 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 (73%), American Airlines (68%), Southwest( 61%).
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 $280, our data shows the cheapest flight currently is $99. When looking at the most popular route, (Lambert-St Louis - Washington, D.C. Reagan-National), you can expect to pay $204 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, February is the cheapest month in which you can book a flight from St. Louis to Washington, D.C. Reagan-National Airport (average of $278). Flying from St. Louis to Washington, D.C. Reagan-National Airport in June is currently the most expensive (average of $345). 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

Arlington

Alexandria

Fairfax

Tysons

Springfield

Woodbridge

Rockville

Fredericksburg

Gaithersburg

Silver Spring

Linthicum Heights

Falls Church

Laurel

Easton

Herndon

Bowie

Gettysburg

National Harbor

Oxon Hill

Reston

Browse thousands of different options on Cheapflights for your next trip

Top 3 airlines flying from St. Louis to Reagan-National

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest$179	Average$284	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$202	Average$303	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$238	Average$337	FlexibilityNo cancel fee	On-time69%

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$96+ 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 4/23. Fares are subject to change and may not be available on all flights or dates of travel.

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

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Lambert-St Louis to Washington, D.C. Reagan-National are usually found in August or September, booked 37 days in advance, depart on a Saturday or Wednesday and return on a Monday

Cheap flight deals from St. Louis to Reagan-National

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from St. Louis to Reagan-National

Cheapest flights from St. Louis to Reagan-NationalExplore 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 April 15, 2025.

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 April 15, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Washington, D.C. Reagan-National Airport that are best for you.

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 April.

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

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

DCA

Our travel experts

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.

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 April 11, 2025.

What is the cheapest month to book a flight from St. Louis to Washington, D.C. Reagan-National Airport?

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 April 15, 2025.

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

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Reagan-National. Price data was last updated on March 30, 2025.

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

Rainfall in Reagan-National by month

Plan your trip to Reagan-National by taking into account the average rainfall totals by month.

Temperature in Reagan-National by month

Plan your trip to Reagan-National by taking into account the average temperature totals by month.

Reviews of airlines servicing Reagan-National

See what other customers who have flown with Alaska Airlines, Southwest and Delta from St. Louis to Washington, D.C. have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

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

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

What are the most reliable airlines from St. Louis to Washington, D.C. Reagan-National Airport?

What are the cheapest flights from St. Louis to Washington, D.C. Reagan-National Airport?

Can I find deals for flights from St. Louis to Reagan-National that include hotel bookings?

How can I find direct flights from St. Louis to Reagan-National?

Can I find deals for business class flights from St. Louis to Reagan-National?

What is the cheapest month to book a flight from St. Louis to Washington, D.C. Reagan-National Airport?

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Alternative routes for St. Louis to Reagan-National

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Top 3 airlines flying from St. Louis to Reagan-National

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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 April 15, 2025.