What airlines fly to Washington, D.C. Reagan-National Airport?

American Airlines, Southwest and Frontier are the top three most popular airlines that fly to Washington, D.C. Reagan-National Airport from St. Louis according to our data. American Airlines is the first choice among our users, with 49% of people opting to fly with this airline when traveling to Washington, D.C. Reagan-National Airport. Keep in mind that there are 3 different airlines that fly to Washington, D.C. Reagan-National Airport on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Lambert-St Louis to Washington, D.C. Reagan-National?

Frontier, Southwest, and Delta are the most popular carriers operating from Lambert-St Louis to Washington, D.C. Reagan-National

When did momondo last update prices for flights from Lambert-St Louis Airport to Washington, D.C. Reagan-National Airport?

Prices for flights from Lambert-St Louis Airport to Washington, D.C. Reagan-National Airport were last updated today.

How many operators does momondo search for flights from Lambert-St Louis Airport to Washington, D.C. Reagan-National Airport?

As of March 2026, there are 3 operators available to choose from for flights from Lambert-St Louis Airport to Washington, D.C. Reagan-National Airport.

How old do you have to be to fly from Lambert-St Louis Airport to Washington, D.C. Reagan-National Airport?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Washington, D.C. Reagan-National Airport.

What documentation or ID do you need to fly to Washington, D.C. Reagan-National Airport?

The necessary travel and health documents for your Washington, D.C. Reagan-National Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$71 Cheap Flights from St. Louis to Washington, D.C. Reagan-National Airport in 2026

Q: How many flights depart from St. Louis to Washington, D.C. Reagan-National Airport on average per day?

As of March 2026, there are 2 flights per day flying from St. Louis to Washington, D.C. Reagan-National Airport. The most common time of day flights depart is 3:00PM, with 57% of flights taking off at noon.

Q: How many flights depart from St. Louis to Washington, D.C. Reagan-National Airport on average per week?

16 flights are operational weekly from St. Louis to Washington, D.C. Reagan-National Airport as of March 2026. The most popular departure day for this route is Wed, with 44% of flights per week taking off on this day.

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One-way

Last minute

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Cheap round-trip flights

Enter your travel dates to find the best prices.

1:20 pm - 4:20 pm

STL

DCA

2h 00mnonstop

1:00 pm - 7:55 pm

DCA

STL

7h 55m

2 stops

$250Southwest

Wed, Mar 25 - Tue, Mar 31

8:16 pm - 12:02 pm

STL

DCA

14h 46m

1 stop

7:00 am - 9:48 am

DCA

STL

27h 48m

1 stop

$253Frontier

Fri, Apr 10 - Sun, Apr 12

8:20 am - 11:15 am

STL

DCA

1h 55mnonstop

11:45 am - 6:55 pm

DCA

STL

8h 10m

1 stop

$254Southwest

Sat, Mar 28 - Sat, Apr 4

11:42 am - 7:34 pm

STL

DCA

6h 52m

1 stop

6:00 am - 10:34 am

DCA

STL

5h 34m

1 stop

$255Delta

Wed, Apr 15 - Sat, Apr 18

7:40 pm - 10:40 pm

STL

DCA

2h 00mnonstop

8:00 am - 9:20 am

DCA

STL

2h 20mnonstop

$256Southwest

Fri, May 1 - Sat, May 2

5:10 am - 11:10 am

STL

DCA

5h 00m

1 stop

9:55 am - 3:05 pm

DCA

STL

6h 10m

1 stop

$258Southwest

Sat, Apr 4 - Tue, Apr 7

8:25 am - 3:05 pm

STL

DCA

5h 40m

1 stop

11:40 am - 5:55 pm

DCA

STL

7h 15m

2 stops

$260Southwest

Wed, Mar 25 - Tue, Mar 31

6:00 am - 9:12 am

STL

DCA

2h 12mnonstop

7:59 pm - 9:34 pm

DCA

STL

2h 35mnonstop

$261American Airlines

Mon, Mar 30 - Fri, Apr 3

6:00 am - 9:12 am

STL

DCA

2h 12mnonstop

8:41 pm - 10:07 pm

DCA

STL

2h 26mnonstop

$263American Airlines

Sat, Apr 4 - Tue, Apr 7

10:15 am - 4:10 pm

STL

DCA

4h 55m

1 stop

4:25 pm - 8:50 pm

DCA

STL

5h 25m

1 stop

$264Southwest

Sat, Mar 28 - Sat, Apr 4

Delta flights from St. Louis to Washington, D.C. Reagan-National Airport

Our best Delta deals on St. Louis to Washington, D.C. Reagan-National Airport flight tickets

Delta

Apr 15

STL11:42 amLambert-St Louis

6h 52m

1 stop

DCA7:34 pmWashington, D.C. Reagan-National

Apr 18

DCA6:00 amWashington, D.C. Reagan-National

5h 34m

1 stop

STL10:34 amLambert-St Louis

$255

Delta

May 14

STL6:00 amLambert-St Louis

5h 59m

1 stop

DCA12:59 pmWashington, D.C. Reagan-National

May 16

DCA6:00 amWashington, D.C. Reagan-National

4h 49m

1 stop

STL9:49 amLambert-St Louis

$285

Delta

Mar 30

STL6:10 amLambert-St Louis

5h 43m

1 stop

DCA12:53 pmWashington, D.C. Reagan-National

Mar 31

DCA6:00 pmWashington, D.C. Reagan-National

6h 58m

1 stop

STL11:58 pmLambert-St Louis

$307

United Airlines flights from St. Louis to Washington, D.C. Reagan-National Airport

Our best United Airlines deals on St. Louis to Washington, D.C. Reagan-National Airport flight tickets

United Airlines

Apr 3

STL6:30 amLambert-St Louis

4h 29m

1 stop

DCA11:59 amWashington, D.C. Reagan-National

Apr 4

DCA6:00 pmWashington, D.C. Reagan-National

6h 57m

1 stop

STL11:57 pmLambert-St Louis

$276

United Airlines

Apr 3

STL6:30 amLambert-St Louis

4h 29m

1 stop

DCA11:59 amWashington, D.C. Reagan-National

Apr 7

DCA6:03 pmWashington, D.C. Reagan-National

4h 49m

1 stop

STL9:52 pmLambert-St Louis

$296

United Airlines

Mar 16

STL7:40 amLambert-St Louis

5h 33m

1 stop

DCA2:13 pmWashington, D.C. Reagan-National

Mar 21

DCA7:00 pmWashington, D.C. Reagan-National

4h 59m

1 stop

STL10:59 pmLambert-St Louis

$514

momondo 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

Wed 3/25

1:20 pm-4:20 pm

Nonstop2h 00m

Washington, D.C. Reagan-National

Tue 3/31

1:00 pm-7:55 pm

2 stops7h 55m

$250

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Fri 4/10

8:16 pm-12:02 pm

1 stop14h 46m

Washington, D.C. Reagan-National

Sun 4/12

7:00 am-9:48 am

1 stop27h 48m

$253

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 3/28

8:20 am-11:15 am

Nonstop1h 55m

Washington, D.C. Reagan-National

Sat 4/4

11:45 am-6:55 pm

1 stop8h 10m

$254

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 4/15

11:42 am-7:34 pm

1 stop6h 52m

Washington, D.C. Reagan-National

Sat 4/18

6:00 am-10:34 am

1 stop5h 34m

$255

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Fri 5/1

7:40 pm-10:40 pm

Nonstop2h 00m

Washington, D.C. Reagan-National

Sat 5/2

8:00 am-9:20 am

Nonstop2h 20m

$256

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 4/4

5:10 am-11:10 am

1 stop5h 00m

Washington, D.C. Reagan-National

Tue 4/7

9:55 am-3:05 pm

1 stop6h 10m

$258

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 3/25

8:25 am-3:05 pm

1 stop5h 40m

Washington, D.C. Reagan-National

Tue 3/31

11:40 am-5:55 pm

2 stops7h 15m

$260

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Mon 3/30

6:00 am-9:12 am

Nonstop2h 12m

Washington, D.C. Reagan-National

Fri 4/3

7:59 pm-9:34 pm

Nonstop2h 35m

$261

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 4/4

6:00 am-9:12 am

Nonstop2h 12m

Washington, D.C. Reagan-National

Tue 4/7

8:41 pm-10:07 pm

Nonstop2h 26m

$263

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 3/28

10:15 am-4:10 pm

1 stop4h 55m

Washington, D.C. Reagan-National

Sat 4/4

4:25 pm-8:50 pm

1 stop5h 25m

$264

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Washington, D.C. Reagan-National Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

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

The month of August is, on average, the cheapest month to fly to Washington, D.C. Reagan-National Airport from St. Louis, with most prices found around $253. If you aren’t able to travel to Washington, D.C. Reagan-National Airport during the month of August, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $277.

What is the cheapest day to depart on your flight to Washington, D.C. Reagan-National Airport?

The cheapest day to depart from St. Louis to Washington, D.C. Reagan-National Airport is on a Saturday. Travelers who choose to depart for Washington, D.C. Reagan-National Airport on a Saturday will often find tickets for as low as $293. Flights from St. Louis to Washington, D.C. Reagan-National Airport on a Sunday will generally be more expensive and average around $387. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Washington, D.C. Reagan-National Airport?

Our data shows that the cheapest St. Louis to Washington, D.C. Reagan-National Airport flights are usually those with departure times at noon. Our users have found flights to Washington, D.C. Reagan-National Airport at noon for as low as $322. In contrast, the most expensive time of day to depart to Washington, D.C. Reagan-National Airport is in the morning when prices are around $346.

What is the cheapest Lambert-St Louis to Washington, D.C. Reagan-National flight route?

Fly from Lambert-St Louis to Washington, D.C. Reagan-National for the best Lambert-St Louis - Washington, D.C. Reagan-National flight prices

How far in advance should I book a flight to Washington, D.C. Reagan-National Airport?

You are more likely to see cheaper flights to Washington, D.C. Reagan-National Airport from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Reagan-National Airport for around $326 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Reagan-National Airport from St. Louis for as low as $241 on momondo.

What cabin class options are available on Lambert-St Louis to Washington, D.C. Reagan-National flights?

There are 3 cabin classes available to choose from on Lambert-St Louis to Washington, D.C. Reagan-National flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on St. Louis to Washington, D.C. Reagan-National Airport flights?

You could potentially save up to 2% on your flight if you consider stops on a St. Louis to Washington, D.C. Reagan-National Airport flight.

How have St. Louis to Washington, D.C. Reagan-National Airport flight prices changed over time?

As of March 2026, prices for St. Louis to Washington, D.C. Reagan-National Airport flights are approximately 16% more expensive when compared to flights at the same time last year.

When to book flights from St. Louis to Washington, D.C. Reagan-National Airport

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Washington, D.C. Reagan-National Airport according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap St. Louis to Washington, D.C. Reagan-National Airport (STL to DCA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Washington, D.C. Reagan-National Airport

Best Price Found	$175
Fastest flight time	1h 55m
Direct flights	Every day

The best one-way flight to Washington, D.C. Reagan-National Airport from St. Louis in the past 72 hours is $175. The best round-trip flight deal from St. Louis to Washington, D.C. Reagan-National Airport found on momondo in the last 72 hours is $297.

The fastest flight from St. Louis to Washington, D.C. Reagan-National Airport takes 1h 55m

Direct flights go from St. Louis to Washington, D.C. Reagan-National Airport every day.

Search flight deals

How far is Lambert-St Louis to Washington, D.C. Reagan-National by plane?
Washington, D.C. Reagan-National is 708.3 mi away from Lambert-St Louis. In terms of flight time, this usually takes a little over 1h 55m.
When did momondo last update prices for flights from Lambert-St Louis Airport to Washington, D.C. Reagan-National Airport?
Prices for flights from Lambert-St Louis Airport to Washington, D.C. Reagan-National Airport were last updated today.
How many operators does momondo search for flights from Lambert-St Louis Airport to Washington, D.C. Reagan-National Airport?
As of March 2026, there are 3 operators available to choose from for flights from Lambert-St Louis Airport to Washington, D.C. Reagan-National Airport.
How old do you have to be to fly from Lambert-St Louis Airport to Washington, D.C. Reagan-National Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Washington, D.C. Reagan-National Airport.
What documentation or ID do you need to fly to Washington, D.C. Reagan-National Airport?
The necessary travel and health documents for your Washington, D.C. Reagan-National Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from St. Louis to Washington, D.C. Reagan-National Airport?
momondo data reveals that the most frequently booked plane model on the route from St. Louis to Washington, D.C. Reagan-National Airport is Boeing 737 MAX 8, representing 21.01% of all bookings. The subsequent popular models are Canadair (Bombardier) Regional Jet 900 at 16.61%, Canadair (Bombardier) Regional Jet 700 at 16.25%, and Embraer 175 at 12.93%.
What is the most popular airline from St. Louis to Washington, D.C. Reagan-National Airport?
Based on momondo bookings for this flight route, the most popular airline on flight routes from St. Louis to Washington, D.C. Reagan-National Airport is Southwest (51% of total bookings). The next most popular airlines are American Airlines (46%) and Frontier (2%).

Best airlines flying from St. Louis to Washington, D.C. Reagan-National Airport

Compare and see reviews for airlines that fly from St. Louis to Washington, D.C. Reagan-National Airport with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $145	Free Cancellation	Rating 5.7 3,042 reviews	Search Frontier flights
American Airlines	PriceFrom $172	Free Cancellation	Rating 7.1 11,380 reviews	Search American Airlines flights
Southwest	PriceFrom $197	Free Cancellation	Rating 8.0 4,305 reviews	Search Southwest flights

Southwest Flights From St. Louis to Washington, D.C. Reagan-National Airport
The lowest priced Southwest flight from St. Louis to Washington, D.C. Reagan-National Airport from the last 72 hours was $197. Generally, Southwest has 7 flights on this route every week with an average price of $324. Southwest is rated 8.0/10 by our users.
American Airlines Flights From St. Louis to Washington, D.C. Reagan-National Airport
The best American Airlines deal for St. Louis to Washington, D.C. Reagan-National Airport flight tickets found on momondo in the last 72 hours was $172, round-trip. It should be noted that an average American Airlines flight deal for this route in this time was higher, at $297 round-trip. American Airlines operates 9 flights out of St. Louis into Washington, D.C. Reagan-National Airport in an average week, so prices vary by time and availability. 11,380 American Airlines reviews by users on momondo have scored the airline at 7.1/10.

Alexandria

National Harbor

Gettysburg

Arlington

Waldorf

Woodbridge

Colonial Beach

Laurel

Towson

Silver Spring

Gaithersburg

Fredericksburg

Rockville

Tysons

Manassas

Springfield

Bethesda

Fairfax

Linthicum Heights

Reston

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Washington, D.C.?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to Washington, D.C.. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from St. Louis to Washington, D.C. with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Washington, D.C. from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Washington, D.C.?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Washington, D.C. from St. Louis.

I’m not ready to book a flight from St. Louis to Washington, D.C. right now. Can momondo alert me if prices change?

Price alerts on flights to Washington, D.C. from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Cheap flights from St. Louis to Washington, D.C. from $71

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Washington, D.C. departing on 5/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Delta flights from St. Louis to Washington, D.C. Reagan-National Airport

Our best Delta deals on St. Louis to Washington, D.C. Reagan-National Airport flight tickets

United Airlines flights from St. Louis to Washington, D.C. Reagan-National Airport

Our best United Airlines deals on St. Louis to Washington, D.C. Reagan-National Airport flight tickets

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

See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from St. Louis to Washington, D.C. Reagan-National Airport

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

What is the cheapest day to depart on your flight to Washington, D.C. Reagan-National Airport?

What is the cheapest time of day to depart on your flight to Washington, D.C. Reagan-National Airport?

What is the cheapest Lambert-St Louis to Washington, D.C. Reagan-National flight route?

How far in advance should I book a flight to Washington, D.C. Reagan-National Airport?

What cabin class options are available on Lambert-St Louis to Washington, D.C. Reagan-National flights?

Can stopping save me money on St. Louis to Washington, D.C. Reagan-National Airport flights?

How have St. Louis to Washington, D.C. Reagan-National Airport flight prices changed over time?

What is the cheapest airline that flies from Lambert-St Louis to Washington, D.C. Reagan-National?

What airlines fly to Washington, D.C. Reagan-National Airport?

How many flights depart from St. Louis to Washington, D.C. Reagan-National Airport on average per day?

How many flights depart from St. Louis to Washington, D.C. Reagan-National Airport on average per week?

When to book flights from St. Louis to Washington, D.C. Reagan-National Airport

Cheap St. Louis to Washington, D.C. Reagan-National Airport (STL to DCA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Washington, D.C. Reagan-National Airport

Best Price Found

Fastest flight time

Direct flights

Best airlines flying from St. Louis to Washington, D.C. Reagan-National Airport

Compare and see reviews for airlines that fly from St. Louis to Washington, D.C. Reagan-National Airport with momondo

Southwest Flights From St. Louis to Washington, D.C. Reagan-National Airport

American Airlines Flights From St. Louis to Washington, D.C. Reagan-National Airport

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