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

$90 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on Delta and United Airlines, with prices starting from $99 and $100, 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 $246, our data shows the cheapest flight currently is $88. When looking at the most popular route, (Lambert-St Louis - Washington, D.C. Reagan-National), you can expect to pay $177 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 (85%), American Airlines (76%), PSA Airlines( 67%).

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 Tuesday can be a cost-effective option. It’s possible to save up to 35% 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 $297. 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 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 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 4 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.

$90+ Save on Flights from St. Louis to Washington, D.C. Reagan-National Airport

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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 September or April, booked 37 days in advance, depart on a Wednesday or Saturday and return on a Wednesday

Cheap flight deals from St. Louis to Reagan-National

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$207 (Southwest)
One-way from	$90 (American Airlines)
Popular in	October
Cheapest in	September
Average price	$328
Good round-trip deal	$257 or less
Good one-way deal	$114 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. 3% potential increase in price ($11 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).

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Average for round-trip flights in March 2025

Search Deals

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 March 21, 2025.

Tue 4/2210:15 amSTL - DCA

1 stop7h 00mSouthwest

Sat 4/266:50 pmDCA - STL

Nonstop2h 15mSouthwest

Deal found 3/21

$207

Tue 4/2212:55 pmSTL - DCA

1 stop7h 01mDelta

Sat 4/266:00 amDCA - STL

1 stop6h 41mDelta

Deal found 3/21

$217

Wed 4/235:45 amSTL - DCA

1 stop7h 35mAmerican Airlines

Thu 4/248:22 amDCA - STL

Nonstop2h 30mAmerican Airlines

Deal found 3/21

$220

Thu 6/126:30 amSTL - DCA

1 stop5h 28mUnited Airlines

Sun 6/1510:30 amDCA - STL

1 stop6h 00mUnited Airlines

Deal found 3/20

$239

Fri 4/46:51 pmSTL - DCA

1 stop16h 13mFrontier

Sun 4/61:03 pmDCA - STL

1 stop21h 03mFrontier

Deal found 3/20

$268

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 March 21, 2025.

Tue 4/2210:15 amSTL - DCA

1 stop7h 00mSouthwest

Sat 4/266:50 pmDCA - STL

Nonstop2h 15mSouthwest

Deal found 3/21

$207

Tue 4/2212:55 pmSTL - DCA

1 stop7h 01mDelta

Sat 4/266:00 amDCA - STL

1 stop6h 41mDelta

Deal found 3/21

$217

Wed 4/235:45 amSTL - DCA

1 stop7h 35mAmerican Airlines

Thu 4/248:22 amDCA - STL

Nonstop2h 30mAmerican Airlines

Deal found 3/21

$220

Thu 6/126:30 amSTL - DCA

1 stop5h 28mUnited Airlines

Sun 6/1510:30 amDCA - STL

1 stop6h 00mUnited Airlines

Deal found 3/20

$239

Fri 4/46:51 pmSTL - DCA

1 stop16h 13mFrontier

Sun 4/61:03 pmDCA - STL

1 stop21h 03mFrontier

Deal found 3/20

$268

Last-minute flights from St. Louis to Reagan-National
Discover last-minute flight deals from St. Louis to Reagan-National. Data last updated March 21, 2025 and is based on user searches.

Thu 3/276:30 amSTL - DCA

1 stop4h 24mUnited Airlines

Sun 3/308:30 amDCA - STL

1 stop4h 50mUnited Airlines

Deal found 3/19

$609

Fri 3/286:24 pmSTL - DCA

Nonstop2h 06mAmerican Airlines

Fri 4/49:05 pmDCA - STL

Nonstop2h 20mAmerican Airlines

Deal found 3/20

$449

Fri 3/284:45 pmSTL - DCA

1 stop4h 49mDelta

Fri 4/47:30 pmDCA - STL

1 stop4h 59mDelta

Deal found 3/20

$469

Fri 3/281:20 pmSTL - DCA

Nonstop1h 55mSouthwest

Mon 3/318:00 amDCA - STL

Nonstop2h 20mSouthwest

Deal found 3/19

$519

Fri 4/46:51 pmSTL - DCA

1 stop16h 13mFrontier

Sun 4/61:03 pmDCA - STL

1 stop21h 03mFrontier

Deal found 3/20

$268

Fri 4/189:39 amSTL - DCA

1 stop5h 02mUnited Airlines

Fri 4/256:20 amDCA - STL

1 stop5h 43mUnited Airlines

Deal found 3/21

$243

Tue 4/2210:15 amSTL - DCA

1 stop7h 00mSouthwest

Sat 4/266:50 pmDCA - STL

Nonstop2h 15mSouthwest

Deal found 3/21

$207

Tue 4/2212:55 pmSTL - DCA

1 stop7h 01mDelta

Sat 4/266:00 amDCA - STL

1 stop6h 41mDelta

Deal found 3/21

$217

Wed 4/235:45 amSTL - DCA

1 stop7h 35mAmerican Airlines

Thu 4/248:22 amDCA - STL

Nonstop2h 30mAmerican Airlines

Deal found 3/21

$220

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 March 21, 2025.

Fri 7/49:52 amSTL - DCA

Nonstop2h 05mAmerican Airlines

Deal found 3/20

$90

Tue 5/133:40 pmSTL - DCA

1 stop3h 56mDelta

Deal found 3/20

$99

Fri 7/45:00 amSTL - DCA

1 stop5h 45mUnited Airlines

Deal found 3/19

$100

Tue 4/2910:15 amSTL - DCA

2 stops6h 45mSouthwest

Deal found 3/20

$104

Wed 4/26:51 pmSTL - DCA

1 stop16h 13mFrontier

Deal found 3/20

$127

Wed 4/210:12 amSTL - DCA

2 stops19h 33mAlaska Airlines

Deal found 3/20

$6,912

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

Tue 4/22

10:15 am-6:15 pm

1 stop7h 00m

Washington, D.C. Reagan-National

Sat 4/26

6:50 pm-8:05 pm

Nonstop2h 15m

$207

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 4/22

12:55 pm-8:56 pm

1 stop7h 01m

Washington, D.C. Reagan-National

Sat 4/26

6:00 am-11:41 am

1 stop6h 41m

$217

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 4/23

5:45 am-2:20 pm

1 stop7h 35m

Washington, D.C. Reagan-National

Thu 4/24

8:22 am-9:52 am

Nonstop2h 30m

$220

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 6/12

6:30 am-12:58 pm

1 stop5h 28m

Washington, D.C. Reagan-National

Sun 6/15

10:30 am-3:30 pm

1 stop6h 00m

$239

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Fri 4/4

6:51 pm-12:04 pm

1 stop16h 13m

Washington, D.C. Reagan-National

Sun 4/6

1:03 pm-9:06 am

1 stop21h 03m

$268

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Fri 7/4

9:52 am-12:57 pm

Nonstop2h 05m

$90

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 5/13

3:40 pm-8:36 pm

1 stop3h 56m

$99

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Fri 7/4

5:00 am-11:45 am

1 stop5h 45m

$100

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 4/29

10:15 am-6:00 pm

2 stops6h 45m

$104

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 4/2

6:51 pm-12:04 pm

1 stop16h 13m

$127

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/20

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 March.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 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 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 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 (6 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 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 Southwest, Alaska Airlines 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.

Southwest

8.1

Very good

4,281 reviews

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

4,281 reviews

Southwest

8.1

Very good

4,281 reviews

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

9,759 reviews

Southwest

8.1

Very good

4,281 reviews

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

4,281 reviews

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

8,605 reviews

Southwest

8.1

Very good

4,281 reviews

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

4,281 reviews

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

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 4 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, Southwest ($207), Delta ($217), and American Airlines ($220) offers the cheapest pricing from St. Louis to Washington, D.C. Reagan-National Airport. Southwest 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?
$90 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on Delta and United Airlines, with prices starting from $99 and $100, 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 (85%), American Airlines (76%), PSA Airlines( 67%).
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 $246, our data shows the cheapest flight currently is $88. When looking at the most popular route, (Lambert-St Louis - Washington, D.C. Reagan-National), you can expect to pay $177 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

Rockville

Woodbridge

Gaithersburg

Fredericksburg

Linthicum Heights

Silver Spring

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$280	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$200	Average$304	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$222	Average$315	FlexibilityNo cancel fee	On-time69%

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$90+ 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 7/4. 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 September or April, booked 37 days in advance, depart on a Wednesday or Saturday and return on a Wednesday

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 March 21, 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 March 21, 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 March.

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 March 14, 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 March 21, 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 16, 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 Southwest, Alaska Airlines 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?

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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 March 21, 2025.