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

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

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

Southwest, American Airlines 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. Southwest is the first choice among our users, with 59% 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.

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 June 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.

$126 Cheap Flights from St. Louis to Washington, D.C. Reagan-National Airport in 2026

Q: What is the typical price of a round-trip flight between St. Louis and Washington, D.C. Reagan-National Airport?

Prices are currently low for flights on this route. Typical prices usually range from $299 to $388. The lowest price recently found on this route was $270.

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

33 flights are operational weekly from St. Louis to Washington, D.C. Reagan-National Airport as of June 2026. The most popular departure day for this route is Mon, with 21% of flights per week taking off on this day.

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

As of June 2026, there are 4 flights per day flying from St. Louis to Washington, D.C. Reagan-National Airport. The most common time of day flights depart is 8:00AM, with 41% of flights taking off at noon.

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Washington, D.C.

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

10:10 am - 6:00 pm

STL

DCA

6h 50m

2 stops

4:35 pm - 10:05 pm

DCA

STL

6h 30m

1 stop

$270Southwest

Thu, Aug 6 - Mon, Aug 10

3:30 pm - 6:30 pm

STL

DCA

2h 00mnonstop

7:25 am - 2:25 pm

DCA

STL

8h 00m

2 stops

$271Southwest

Mon, Aug 3 - Wed, Aug 5

8:08 pm - 12:51 pm

STL

DCA

15h 43m

1 stop

7:00 am - 7:23 pm

DCA

STL

13h 23m

1 stop

$272Frontier

Wed, Jul 22 - Sun, Jul 26

1:15 pm - 7:48 pm

STL

DCA

5h 33m

1 stop

6:20 am - 11:47 am

DCA

STL

6h 27m

1 stop

$273Delta

Sat, Jul 25 - Thu, Aug 6

6:43 am - 9:46 am

STL

DCA

2h 03mnonstop

8:00 pm - 9:21 pm

DCA

STL

2h 21mnonstop

$275American Airlines

Mon, Jul 20 - Mon, Aug 3

6:09 pm - 10:59 pm

STL

DCA

3h 50m

1 stop

12:27 pm - 4:17 pm

DCA

STL

4h 50m

1 stop

$276Delta

Mon, Jul 27 - Tue, Aug 4

6:43 am - 9:46 am

STL

DCA

2h 03mnonstop

8:00 pm - 9:21 pm

DCA

STL

2h 21mnonstop

$277American Airlines

Mon, Jul 20 - Thu, Jul 23

8:08 pm - 4:59 pm

STL

DCA

19h 51m

1 stop

7:00 am - 7:23 pm

DCA

STL

13h 23m

1 stop

$278Frontier

Wed, Jul 8 - Wed, Jul 15

8:08 pm - 9:59 pm

STL

DCA

24h 51m

1 stop

6:00 pm - 7:23 pm

DCA

STL

26h 23m

1 stop

$279Frontier

Thu, Jul 16 - Mon, Jul 20

8:08 pm - 12:51 pm

STL

DCA

15h 43m

1 stop

7:00 am - 7:23 pm

DCA

STL

13h 23m

1 stop

$281Frontier

Fri, Jul 24 - Sat, Aug 8

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

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

Frontier

Jul 22

STL8:08 pmLambert-St Louis

15h 43m

1 stop

DCA12:51 pmWashington, D.C. Reagan-National

Jul 26

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

13h 23m

1 stop

STL7:23 pmLambert-St Louis

$272

Frontier

Jul 8

STL8:08 pmLambert-St Louis

19h 51m

1 stop

DCA4:59 pmWashington, D.C. Reagan-National

Jul 15

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

13h 23m

1 stop

STL7:23 pmLambert-St Louis

$278

Frontier

Jul 16

STL8:08 pmLambert-St Louis

24h 51m

1 stop

DCA9:59 pmWashington, D.C. Reagan-National

Jul 20

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

26h 23m

1 stop

STL7:23 pmLambert-St Louis

$279

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

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

Southwest

Aug 6

STL10:10 amLambert-St Louis

6h 50m

2 stops

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

Aug 10

DCA4:35 pmWashington, D.C. Reagan-National

6h 30m

1 stop

STL10:05 pmLambert-St Louis

$270

Southwest

Aug 3

STL3:30 pmLambert-St Louis

2h 00m

DCA6:30 pmWashington, D.C. Reagan-National

Aug 5

DCA7:25 amWashington, D.C. Reagan-National

8h 00m

2 stops

STL2:25 pmLambert-St Louis

$271

Southwest

Aug 12

STL10:15 amLambert-St Louis

6h 45m

1 stop

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

Aug 15

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

8h 15m

2 stops

STL1:15 pmLambert-St Louis

$282

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

Cheapest round-trip

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 8/6

10:10 am-6:00 pm

2 stops6h 50m

Washington, D.C. Reagan-National

Mon 8/10

4:35 pm-10:05 pm

1 stop6h 30m

$270

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Mon 8/3

3:30 pm-6:30 pm

Nonstop2h 00m

Washington, D.C. Reagan-National

Wed 8/5

7:25 am-2:25 pm

2 stops8h 00m

$271

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 7/22

8:08 pm-12:51 pm

1 stop15h 43m

Washington, D.C. Reagan-National

Sun 7/26

7:00 am-7:23 pm

1 stop13h 23m

$272

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 7/25

1:15 pm-7:48 pm

1 stop5h 33m

Washington, D.C. Reagan-National

Thu 8/6

6:20 am-11:47 am

1 stop6h 27m

$273

Quickest round-trip

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Mon 7/20

6:43 am-9:46 am

Nonstop2h 03m

Washington, D.C. Reagan-National

Mon 8/3

8:00 pm-9:21 pm

Nonstop2h 21m

$275

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Mon 7/27

6:09 pm-10:59 pm

1 stop3h 50m

Washington, D.C. Reagan-National

Tue 8/4

12:27 pm-4:17 pm

1 stop4h 50m

$276

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Mon 7/20

6:43 am-9:46 am

Nonstop2h 03m

Washington, D.C. Reagan-National

Thu 7/23

8:00 pm-9:21 pm

Nonstop2h 21m

$277

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 7/8

8:08 pm-4:59 pm

1 stop19h 51m

Washington, D.C. Reagan-National

Wed 7/15

7:00 am-7:23 pm

1 stop13h 23m

$278

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 7/16

8:08 pm-9:59 pm

1 stop24h 51m

Washington, D.C. Reagan-National

Mon 7/20

6:00 pm-7:23 pm

1 stop26h 23m

$279

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Fri 7/24

8:08 pm-12:51 pm

1 stop15h 43m

Washington, D.C. Reagan-National

Sat 8/8

7:00 am-7:23 pm

1 stop13h 23m

$281

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 typical price of a round-trip flight between St. Louis and Washington, D.C. Reagan-National Airport?

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

The month of September is, on average, the cheapest month to fly to Washington, D.C. Reagan-National Airport from St. Louis, with most prices found around $283. If you aren’t able to travel to Washington, D.C. Reagan-National Airport during the month of September, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $293.

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 Tuesday. Travelers who choose to depart for Washington, D.C. Reagan-National Airport on a Tuesday will often find tickets for as low as $324. Flights from St. Louis to Washington, D.C. Reagan-National Airport on a Sunday will generally be more expensive and average around $411. 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 $338. In contrast, the most expensive time of day to depart to Washington, D.C. Reagan-National Airport is in the evening when prices are around $389.

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 from St. Louis 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 $360 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 $180 on momondo.

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

There are 3 cabin classes available to choose from on St. Louis to Washington, D.C. Reagan-National Airport 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 22% 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 June 2026, prices for St. Louis to Washington, D.C. Reagan-National Airport flights are approximately 18% 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	$191
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 $191. 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 $325.

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

Frequently asked questions about flying from St. Louis to Washington, D.C. Reagan-National Airport

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 June 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 Canadair (Bombardier) Regional Jet 900, representing 24.35% of all bookings. The subsequent popular models are Boeing 737 MAX 8 at 23.58%, Canadair (Bombardier) Regional Jet 700 at 17.97%, and Canadair (Bombardier) Regional Jet CRJ-550 at 13.21%.
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 (61% of total bookings). The next most popular airlines are American Airlines (36%) and Frontier (3%).

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 $96	Free Cancellation	Rating 5.6 2,856 reviews	Search Frontier flights
American Airlines	PriceFrom $197	Free Cancellation	Rating 7.1 11,774 reviews	Search American Airlines flights
Southwest	PriceFrom $199	Free Cancellation	Rating 7.9 4,246 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 $199. Generally, Southwest has 18 flights on this route every week with an average price of $366. Southwest is rated 7.9/10 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 $197, round-trip. It should be noted that an average American Airlines flight deal for this route in this time was higher, at $335 round-trip. American Airlines operates 15 flights out of St. Louis into Washington, D.C. Reagan-National Airport in an average week, so prices vary by time and availability. 11,774 American Airlines reviews by users on momondo have scored the airline at 7.1/10.

Alexandria

National Harbor

Arlington

Gettysburg

Waldorf

Laurel

Woodbridge

Fredericksburg

Gaithersburg

Colonial Beach

Linthicum Heights

Rockville

Silver Spring

Towson

Manassas

Tysons

Springfield

Fairfax

Bethesda

Glen Burnie

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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 $126

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 8/27. 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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Frontier flights from St. Louis to Washington, D.C. Reagan-National Airport

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

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

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

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.

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 typical price of a round-trip flight between St. Louis and 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 from St. Louis to Washington, D.C. Reagan-National Airport?

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

Frequently asked questions about flying from St. Louis to Washington, D.C. Reagan-National Airport

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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