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

$113 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 Southwest and United Airlines, with prices starting from $114 and $123, respectively.

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 Friday evenings 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.

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.

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).

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 $264, our data shows the cheapest flight currently is $89. When looking at the most popular route, (Lambert-St Louis - Washington, D.C. Reagan-National), you can expect to pay $197 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: PSA Airlines (80%), American Airlines (80%), Southwest( 54%).

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 28% 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 $133. The most expensive prices can be found in the month of March.

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 3 outbound flights to Washington, D.C. Reagan-National per day from 2 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.

$109+ Flights from St. Louis to Washington, D.C. Reagan-National Airport

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1. Tell us where you want to go

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Cheapflights Tip: The best prices from Lambert-St Louis to Washington, D.C. Reagan-National are usually found in August or September, booked 50 days in advance, depart on a Saturday or Tuesday and return on a Wednesday

Cheap flight deals from St. Louis to Reagan-National

Round-trip from	$198 (Southwest)
One-way from	$113 (American Airlines)
Popular in	October
Cheapest in	August
Average price	$284
Good round-trip deal	$253 or less
Good one-way deal	$114 or less

From Lambert-St Louis to Washington, D.C. Reagan-National

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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 ($14 potential increase over avg. RT price).

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

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Average for round-trip flights in July 2025

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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 July 3, 2025.

Thu 8/287:50 amSTL - DCA

1 stop4h 00mSouthwest

Sun 8/316:55 amDCA - STL

Nonstop2h 10mSouthwest

Deal found 7/3

$198

Thu 8/286:00 amSTL - DCA

1 stop4h 20mDelta

Sun 8/3112:20 pmDCA - STL

1 stop4h 46mDelta

Deal found 7/3

$208

Wed 11/56:24 pmSTL - DCA

Nonstop2h 06mAmerican Airlines

Sat 11/87:45 pmDCA - STL

Nonstop2h 27mAmerican Airlines

Deal found 7/2

$211

Wed 7/237:29 pmSTL - DCA

1 stop20h 30mFrontier

Sun 7/276:00 pmDCA - STL

1 stop16h 11mFrontier

Deal found 7/3

$271

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 July 3, 2025.

Thu 8/287:50 amSTL - DCA

1 stop4h 00mSouthwest

Sun 8/316:55 amDCA - STL

Nonstop2h 10mSouthwest

Deal found 7/3

$198

Thu 8/286:00 amSTL - DCA

1 stop4h 20mDelta

Sun 8/3112:20 pmDCA - STL

1 stop4h 46mDelta

Deal found 7/3

$208

Wed 11/56:24 pmSTL - DCA

Nonstop2h 06mAmerican Airlines

Sat 11/87:45 pmDCA - STL

Nonstop2h 27mAmerican Airlines

Deal found 7/2

$211

Wed 7/237:29 pmSTL - DCA

1 stop20h 30mFrontier

Sun 7/276:00 pmDCA - STL

1 stop16h 11mFrontier

Deal found 7/3

$271

Thu 7/246:33 amSTL - DCA

1 stop4h 26mUnited Airlines

Sun 7/277:00 pmDCA - STL

1 stop5h 43mUnited Airlines

Deal found 7/3

$276

Last-minute flights from St. Louis to Reagan-National
Discover last-minute flight deals from St. Louis to Reagan-National. Data last updated July 3, 2025 and is based on user searches.

Wed 7/97:29 pmSTL - DCA

1 stop15h 35mFrontier

Fri 7/116:00 pmDCA - STL

1 stop16h 11mFrontier

Deal found 7/2

$267

Wed 7/99:40 amSTL - DCA

Nonstop2h 09mAmerican Airlines

Mon 8/112:56 pmDCA - STL

Nonstop2h 18mAmerican Airlines

Deal found 7/1

$363

Wed 7/95:45 pmSTL - DCA

1 stop5h 05mSouthwest

Mon 8/116:55 amDCA - STL

2 stops7h 40mSouthwest

Deal found 7/1

$482

Wed 7/910:00 amSTL - DCA

1 stop6h 01mUnited Airlines

Fri 7/112:00 pmDCA - STL

1 stop5h 07mUnited Airlines

Deal found 7/2

$617

Sat 7/126:00 amSTL - DCA

1 stop4h 00mDelta

Tue 7/226:05 amDCA - STL

1 stop4h 28mDelta

Deal found 7/2

$504

Wed 7/237:29 pmSTL - DCA

1 stop20h 30mFrontier

Sun 7/276:00 pmDCA - STL

1 stop16h 11mFrontier

Deal found 7/3

$271

Thu 8/287:50 amSTL - DCA

1 stop4h 00mSouthwest

Sun 8/316:55 amDCA - STL

Nonstop2h 10mSouthwest

Deal found 7/3

$198

Thu 8/286:00 amSTL - DCA

1 stop4h 20mDelta

Sun 8/3112:20 pmDCA - STL

1 stop4h 46mDelta

Deal found 7/3

$208

Thu 8/285:30 pmSTL - DCA

1 stop4h 13mUnited Airlines

Wed 9/312:00 pmDCA - STL

1 stop4h 44mUnited Airlines

Deal found 7/1

$303

Sat 8/307:23 amSTL - DCA

1 stop6h 09mAmerican Airlines

Mon 9/17:51 pmDCA - STL

Nonstop2h 11mAmerican Airlines

Deal found 7/1

$224

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 July 3, 2025.

Sat 8/96:02 amSTL - DCA

Nonstop2h 01mAmerican Airlines

Deal found 7/2

$113

Thu 9/119:50 amSTL - DCA

2 stops7h 20mSouthwest

Deal found 7/2

$114

Sat 8/305:30 pmSTL - DCA

1 stop4h 13mUnited Airlines

Deal found 7/2

$123

Fri 8/157:29 pmSTL - DCA

1 stop15h 35mFrontier

Deal found 7/2

$124

Wed 7/301:29 pmSTL - DCA

1 stop7h 15mDelta

Deal found 7/2

$125

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 8/28

7:50 am-12:50 pm

1 stop4h 00m

Washington, D.C. Reagan-National

Sun 8/31

6:55 am-8:05 am

Nonstop2h 10m

$198

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 8/28

6:00 am-11:20 am

1 stop4h 20m

Washington, D.C. Reagan-National

Sun 8/31

12:20 pm-4:06 pm

1 stop4h 46m

$208

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 8/30

6:00 am-11:30 am

1 stop4h 30m

Washington, D.C. Reagan-National

Mon 9/1

7:51 pm-9:02 pm

Nonstop2h 11m

$224

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 7/23

7:29 pm-4:59 pm

1 stop20h 30m

Washington, D.C. Reagan-National

Sun 7/27

6:00 pm-9:11 am

1 stop16h 11m

$271

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 7/24

6:33 am-11:59 am

1 stop4h 26m

Washington, D.C. Reagan-National

Sun 7/27

7:00 pm-11:43 pm

1 stop5h 43m

$276

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 8/19

9:17 am-5:01 pm

1 stop6h 44m

$109

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 9/6

7:01 am-10:03 am

Nonstop2h 02m

$113

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 9/11

9:50 am-6:10 pm

2 stops7h 20m

$114

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Fri 8/15

7:29 pm-12:04 pm

1 stop15h 35m

$124

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 7/30

1:29 pm-7:44 pm

1 stop5h 15m

$125

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

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 online for real-time wait times during peak periods.

DCA

DCA is easily accessible via the Metro, with a dedicated stop on the Yellow and Blue lines, making it the most affordable transport option.

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 50 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 March is currently the most expensive (average of $335). 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 18% on the cost of your flight, compared to a flight in the morning.

Reviews of airlines servicing Reagan-National

Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from St. Louis to Washington, D.C. Reagan-National Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Southwest

8.0

Very good

4,266 reviews

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Delta

8.0

Very good

7,982 reviews

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

United Airlines

7.4

Good

8,861 reviews

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

American Airlines

7.2

Good

10,000 reviews

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Frontier

5.9

Fair

3,286 reviews

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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 3 outbound flights to Washington, D.C. Reagan-National per day from 2 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 ($198), Delta ($208), and American Airlines ($211) offers the cheapest pricing from St. Louis to Washington, D.C. Reagan-National Airport. Southwest is priced at 32% 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?
$113 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 Southwest and United Airlines, with prices starting from $114 and $123, 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: PSA Airlines (80%), American Airlines (80%), Southwest( 54%).
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 $264, our data shows the cheapest flight currently is $89. When looking at the most popular route, (Lambert-St Louis - Washington, D.C. Reagan-National), you can expect to pay $197 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 March is currently the most expensive (average of $335). 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

Woodbridge

Alexandria

Tysons

Silver Spring

Fredericksburg

Linthicum Heights

Gaithersburg

Fairfax

Easton

Towson

Waldorf

Laurel

Falls Church

Rockville

Springfield

National Harbor

Manassas

Dundalk

Bowie

Browse thousands of different options on Cheapflights for your next trip

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

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest$170	Average$288	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$202	Average$297	FlexibilityNo cancel fee	On-time63%

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$109+ 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 8/19. 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 50 days in advance, depart on a Saturday or Tuesday and return on a Wednesday

Cheap flight deals from St. Louis to Reagan-National

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 July 3, 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 July 3, 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.

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 June 27, 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 July 3, 2025.

Reviews of airlines servicing Reagan-National

Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from St. Louis to Washington, D.C. Reagan-National Airport by reading reviews from past customers. Users have also rated airlines 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?

Traveling to a place near St. Louis?

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Alternative routes for St. Louis to Reagan-National

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Top 2 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 July 3, 2025.