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Cheap flights from Washington, D.C. Reagan-National Airport to St. Louis from $62

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. Reagan-National Airport to St. Louis departing on 2/11. 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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Find the cheapest flights from Washington, D.C. Reagan-National Airport to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:00 am - 8:08 pm
DCA
-
STL
13h 08m2 stops
Frontier Logo
1:40 pm - 9:59 pm
STL
-
DCA
7h 19m1 stop
$260Frontier
Mon, Jan 19 - Mon, Jan 26
American Airlines Logo
7:40 am - 9:24 am
DCA
-
STL
2h 44mnonstop
American Airlines Logo
5:59 pm - 9:10 pm
STL
-
DCA
2h 11mnonstop
$261American Airlines
Thu, Jan 15 - Sun, Jan 18
Southwest Logo
11:00 am - 5:05 pm
DCA
-
STL
7h 05m2 stops
Southwest Logo
6:20 am - 3:25 pm
STL
-
DCA
8h 05m2 stops
$265Southwest
Wed, Jan 21 - Wed, Jan 28
Delta Logo
8:35 pm - 8:53 am
DCA
-
STL
13h 18m1 stop
Delta Logo
12:00 pm - 5:00 pm
STL
-
DCA
4h 00m1 stop
$270Delta
Mon, Jan 12 - Sat, Jan 17
American Airlines Logo
9:35 am - 1:03 pm
DCA
-
STL
4h 28m1 stop
American Airlines Logo
9:54 am - 12:59 pm
STL
-
DCA
2h 05mnonstop
$271American Airlines
Thu, Jan 15 - Sun, Jan 18
Southwest Logo
12:00 pm - 1:35 pm
DCA
-
STL
2h 35mnonstop
Southwest Logo
6:00 pm - 9:00 pm
STL
-
DCA
2h 00mnonstop
$273Southwest
Mon, Jan 12 - Wed, Jan 14
Delta Logo
8:35 pm - 8:53 am
DCA
-
STL
13h 18m1 stop
Delta Logo
9:59 am - 3:00 pm
STL
-
DCA
4h 01m1 stop
$274Delta
Mon, Jan 26 - Sat, Jan 31
Southwest Logo
4:25 pm - 11:35 pm
DCA
-
STL
8h 10m2 stops
Southwest Logo
6:00 pm - 9:00 pm
STL
-
DCA
2h 00mnonstop
$276Southwest
Thu, Jan 15 - Sun, Jan 18
American Airlines Logo
7:39 am - 9:15 am
DCA
-
STL
2h 36mnonstop
American Airlines Logo
6:00 am - 9:12 am
STL
-
DCA
2h 12mnonstop
$278American Airlines
Mon, Mar 9 - Wed, Mar 11
Southwest Logo
8:00 am - 9:35 am
DCA
-
STL
2h 35mnonstop
Southwest Logo
9:40 am - 2:55 pm
STL
-
DCA
4h 15m1 stop
$279Southwest
Tue, Jan 13 - Thu, Jan 15

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

Our best Frontier deals on Washington, D.C. Reagan-National Airport to St. Louis flight tickets
Frontier
Jan 19
DCA8:00 amWashington, D.C. Reagan-National
13h 08m
2 stops
STL8:08 pmLambert-St Louis
Jan 26
STL1:40 pmLambert-St Louis
7h 19m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
$260
Find similar
Frontier
Jan 8
DCA6:00 pmWashington, D.C. Reagan-National
17h 02m
1 stop
STL10:02 amLambert-St Louis
Jan 11
STL9:46 pmLambert-St Louis
18h 13m
2 stops
DCA4:59 pmWashington, D.C. Reagan-National
$286
Find similar
Frontier
Dec 30
DCA6:00 pmWashington, D.C. Reagan-National
17h 02m
1 stop
STL10:02 amLambert-St Louis
Jan 7
STL7:43 pmLambert-St Louis
20h 16m
1 stop
DCA4:59 pmWashington, D.C. Reagan-National
$293
Find similar

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

Our best American Airlines deals on Washington, D.C. Reagan-National Airport to St. Louis flight tickets
American Airlines
Jan 15
DCA7:40 amWashington, D.C. Reagan-National
2h 44m
STL9:24 amLambert-St Louis
Jan 18
STL5:59 pmLambert-St Louis
2h 11m
DCA9:10 pmWashington, D.C. Reagan-National
$261
Find similar
American Airlines
Jan 15
DCA9:35 amWashington, D.C. Reagan-National
4h 28m
1 stop
STL1:03 pmLambert-St Louis
Jan 18
STL9:54 amLambert-St Louis
2h 05m
DCA12:59 pmWashington, D.C. Reagan-National
$271
Find similar
American Airlines
Dec 25
DCA6:46 amWashington, D.C. Reagan-National
4h 13m
1 stop
STL9:59 amLambert-St Louis
Jan 1
STL6:02 amLambert-St Louis
2h 08m
DCA9:10 amWashington, D.C. Reagan-National
$272
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Reagan-National Airport to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 18, 2025.
Use the filters below to find and compare flights from Washington, D.C. Reagan-National Airport to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 1/19

8:00 am-8:08 pm

2 stops13h 08m

Lambert-St Louis

Mon 1/26

1:40 pm-9:59 pm

1 stop7h 19m

$260

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 1/15

7:40 am-9:24 am

Nonstop2h 44m

Lambert-St Louis

Sun 1/18

5:59 pm-9:10 pm

Nonstop2h 11m

$261

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Wed 1/21

11:00 am-5:05 pm

2 stops7h 05m

Lambert-St Louis

Wed 1/28

6:20 am-3:25 pm

2 stops8h 05m

$265

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 1/12

8:35 pm-8:53 am

1 stop13h 18m

Lambert-St Louis

Sat 1/17

12:00 pm-5:00 pm

1 stop4h 00m

$270

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 1/15

9:35 am-1:03 pm

1 stop4h 28m

Lambert-St Louis

Sun 1/18

9:54 am-12:59 pm

Nonstop2h 05m

$271

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 1/12

12:00 pm-1:35 pm

Nonstop2h 35m

Lambert-St Louis

Wed 1/14

6:00 pm-9:00 pm

Nonstop2h 00m

$273

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 1/26

8:35 pm-8:53 am

1 stop13h 18m

Lambert-St Louis

Sat 1/31

9:59 am-3:00 pm

1 stop4h 01m

$274

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 1/15

4:25 pm-11:35 pm

2 stops8h 10m

Lambert-St Louis

Sun 1/18

6:00 pm-9:00 pm

Nonstop2h 00m

$276

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 3/9

7:39 am-9:15 am

Nonstop2h 36m

Lambert-St Louis

Wed 3/11

6:00 am-9:12 am

Nonstop2h 12m

$278

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 1/13

8:00 am-9:35 am

Nonstop2h 35m

Lambert-St Louis

Thu 1/15

9:40 am-2:55 pm

1 stop4h 15m

$279

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to St. Louis from

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

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

What is the cheapest month to fly to St. Louis?

In general, August is the cheapest month to fly from Washington, D.C. Reagan-National Airport to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $267. The month of February is another great option to travel to St. Louis, with average flight prices from Washington, D.C. Reagan-National Airport averaging around $279.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Saturday when prices can be found for as low as $344. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $409. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Washington, D.C. Reagan-National Airport in the evening is the least expensive time of day to depart. momondo users have found prices as low as $312 when looking at flights departing in the evening. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $380 per ticket.

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

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

How far in advance should I book a flight to St. Louis?

You are more likely to see cheaper flights to St. Louis from Washington, D.C. Reagan-National Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $327 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Washington, D.C. Reagan-National Airport for as low as $225 on momondo.

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

There are 3 cabin classes available to choose from on Washington, D.C. Reagan-National to Lambert-St Louis 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 Washington, D.C. Reagan-National Airport to St. Louis flights?

You could potentially save up to 10% on your flight if you consider stops on a Washington, D.C. Reagan-National Airport to St. Louis flight.

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

As of December 2025, prices for Washington, D.C. Reagan-National Airport to St. Louis flights are approximately 44% more expensive when compared to flights at the same time last year.

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

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

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

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

Best Price Found

$173

Fastest flight time

2h 15m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Washington, D.C. Reagan-National Airport in the past 72 hours is $173. The best round-trip flight deal from Washington, D.C. Reagan-National Airport to St. Louis found on momondo in the last 72 hours is $340.
The fastest flight from Washington, D.C. Reagan-National Airport to St. Louis takes 2h 15m
Direct flights go from Washington, D.C. Reagan-National Airport to St. Louis every day.
There is 1 airport in St. Louis. From Washington, D.C. Reagan-National Airport there are direct flights to Lambert-St Louis (STL).
Search flight deals

  • How far is Washington, D.C. Reagan-National to Lambert-St Louis by plane?

    Washington, D.C. Reagan-National and Lambert-St Louis are 708.3 mi apart from one another. In terms of flight time, this usually takes a little over 2h 15m.

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

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

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. Reagan-National Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Washington, D.C. Reagan-National Airport to St. Louis?

  • What is the most popular airline from Washington, D.C. Reagan-National Airport to St. Louis?

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

Compare and see reviews for airlines that fly from Washington, D.C. Reagan-National Airport to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $172Free CancellationRating
7.2
11,054 reviews
Search American Airlines flights
SouthwestPriceFrom $187Free CancellationRating
7.9
4,250 reviews
Search Southwest flights
United AirlinesPriceFrom $223Free CancellationRating
7.4
9,091 reviews
Search United Airlines flights
DeltaPriceFrom $223Free CancellationRating
7.9
8,005 reviews
Search Delta flights

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

    Southwest flies from Washington, D.C. Reagan-National Airport to St. Louis around 9 times per week, with 4,250 momondo users rating the airline 7.9/10. The cheapest Southwest deal from Washington, D.C. Reagan-National Airport to St. Louis in the last 72 hours was $187 (round-trip), much lower than the average airfare cost of $333 for Southwest flights on this route.

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

    American Airlines (7.2/10 from 11,054 reviews) operates around 9 flights from Washington, D.C. Reagan-National Airport to St. Louis in any given week. The average American Airlines airfare for this route is around $325, with deals from around $172 rare but found on momondo. Referenced prices are for round-trip Washington, D.C. Reagan-National Airport to St. Louis flight searches in the last 72 hours.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
O'Fallon
Florissant
Fenton
Wentzville
St. Peters
Collinsville
Alton
Clayton
Festus
Glencoe
Farmington
Eureka
Edwardsville
Litchfield
Shrewsbury

Why use momondo?

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

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

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

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

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Washington, D.C. to St. Louis.

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

Price alerts on flights to St. Louis from Washington, D.C. 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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