What is the cheapest airline that flies from Lambert-St Louis to District of Columbia?

Frontier, Southwest, and United Airlines are the most popular carriers operating from Lambert-St Louis to District of Columbia

How many flights depart from St. Louis to District of Columbia on average per week?

The number of flights available between St. Louis and District of Columbia is 81 per week as of November 2026. The most frequent departure day is Mon, with 16% of weekly flights leaving on this day.

How many flights depart from St. Louis to District of Columbia on average per day?

11 flights are operational daily from St. Louis to District of Columbia as of November 2026. The most popular departure time for this route is 1:00PM, with 48% of flights per day taking off at noon.

What airlines fly to District of Columbia?

Southwest, American Airlines and United Airlines are the top three most popular airlines that fly to District of Columbia from St. Louis according to our data. Southwest is the first choice among our users, with 60% of people opting to fly with this airline when traveling to District of Columbia. Keep in mind that there are 6 different airlines that fly to District of Columbia 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 District of Columbia?

Prices for flights from Lambert-St Louis Airport to District of Columbia refresh daily.

How many operators does momondo search for flights from Lambert-St Louis Airport to District of Columbia?

As of November 2026, there are 6 operators available to choose from for flights from Lambert-St Louis Airport to District of Columbia.

How old do you have to be to fly from Lambert-St Louis Airport to District of Columbia?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to District of Columbia.

What documentation or ID do you need to fly to District of Columbia?

The travel and health documents you'll need for your trip to District of Columbia may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at District of Columbia. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$69 Cheap Flights from St. Louis to District of Columbia in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to District of Columbia

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:13 pm - 2:49 pmSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

19h 36m2 stops Orlando Atlanta Hartsfield-Jackson

8:26 pm - 12:12 amIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

28h 46m1 stop Orlando

$258Frontier

Thu, Dec 3 - Mon, Dec 7

6:38 am - 9:44 amSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

2h 06mnonstop

8:16 am - 10:02 amDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

2h 46mnonstop

$259American Airlines

Sat, Dec 5 - Sat, Dec 12

4:00 pm - 6:55 pmSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

1h 55mnonstop

12:00 pm - 1:30 pmDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

2h 30mnonstop

$259Southwest

Tue, Dec 15 - Sat, Jan 16

1:17 pm - 4:22 pmSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

2h 05mnonstop

8:35 am - 10:08 amIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

2h 33mnonstop

$259United Airlines

Tue, Dec 15 - Sat, Jan 16

8:30 am - 11:37 amSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

2h 07mnonstop

5:55 pm - 7:27 pmIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

2h 32mnonstop

$259United Airlines

Wed, Jan 20 - Wed, Jan 27

6:48 am - 10:00 amSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

2h 12mnonstop

1:38 pm - 3:17 pmDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

2h 39mnonstop

$259American Airlines

Wed, Jan 20 - Wed, Jan 27

5:15 pm - 5:10 amSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

10h 55m1 stop Las Vegas Harry Reid Intl

6:50 am - 5:40 pmIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

11h 50m1 stop Atlanta Hartsfield-Jackson

$260Frontier

Tue, Nov 24 - Mon, Nov 30

6:05 am - 11:25 amSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

4h 20m1 stop Chicago Midway

12:00 pm - 1:30 pmDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

2h 30mnonstop

$269Southwest

Wed, Jan 20 - Wed, Jan 27

10:14 am - 4:23 pmSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

5h 09m1 stop Detroit Metropolitan Wayne County

11:30 am - 5:20 pmIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

6h 50m1 stop Detroit Metropolitan Wayne County

$278Delta

Fri, Dec 11 - Fri, Dec 18

6:00 am - 11:43 amSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

4h 43m1 stop Atlanta Hartsfield-Jackson

7:39 pm - 12:05 amIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

5h 26m1 stop Atlanta Hartsfield-Jackson

$278Delta

Thu, Dec 10 - Thu, Dec 10

Cheap last minute flights

Enter your travel dates to find the best prices.

7:59 pm - 12:09 pmSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

15h 10m1 stop Denver Intl

1:20 pm - 3:26 pmDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

27h 06m1 stop Denver Intl

$298Frontier

Sat, Nov 14 - Thu, Dec 31

4:26 pm - 10:21 amSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

16h 55m1 stop Orlando

10:59 pm - 10:53 amIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

12h 54m1 stop Atlanta Hartsfield-Jackson

$316Frontier

Sat, Nov 14 - Thu, Dec 31

1:00 pm - 4:09 pmSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

2h 09mnonstop

8:32 am - 10:05 amIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

2h 33mnonstop

$351United Airlines

Sat, Nov 14 - Thu, Dec 31

10:37 am - 1:44 pmSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

2h 07mnonstop

8:14 am - 9:57 amDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

2h 43mnonstop

$356American Airlines

Sat, Nov 14 - Thu, Dec 31

8:00 am - 11:10 amSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

2h 10mnonstop

1:04 pm - 5:08 pmIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

5h 04m1 stop Chicago O'Hare Intl

$361United Airlines

Sat, Nov 14 - Thu, Dec 31

7:05 am - 10:09 amSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

2h 04mnonstop

5:30 pm - 11:59 pmDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

7h 29m1 stop Charlotte Douglas

$366American Airlines

Sat, Nov 14 - Thu, Dec 31

10:40 am - 8:45 pmSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

9h 05m2 stops Cleveland Hopkins Intl Orlando

12:45 pm - 5:25 pmDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

5h 40m1 stop Dallas Love Field

$411Southwest

Sat, Nov 14 - Thu, Dec 31

7:18 pm - 12:41 amSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

4h 23m1 stop Atlanta Hartsfield-Jackson

6:00 am - 9:25 amIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

4h 25m1 stop Detroit Metropolitan Wayne County

$485Delta

Fri, Nov 13 - Tue, Nov 17

11:00 am - 4:23 pmSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

4h 23m1 stop Atlanta Hartsfield-Jackson

6:00 am - 9:25 amIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

4h 25m1 stop Detroit Metropolitan Wayne County

$485Delta

Sat, Nov 14 - Sun, Nov 22

8:40 am - 11:35 amSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

1h 55mnonstop

6:55 pm - 8:30 pmDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

2h 35mnonstop

$535Southwest

Tue, Nov 10 - Tue, Nov 10

Cheap direct flights

Enter your travel dates to find the best prices.

1:17 pm - 4:22 pmSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

2h 05mnonstop

8:35 am - 10:08 amIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

2h 33mnonstop

$259United Airlines

Tue, Dec 15 - Sat, Jan 16

8:30 am - 11:37 amSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

2h 07mnonstop

5:55 pm - 7:27 pmIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

2h 32mnonstop

$259United Airlines

Wed, Jan 20 - Wed, Jan 27

4:00 pm - 6:55 pmSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

1h 55mnonstop

12:00 pm - 1:30 pmDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

2h 30mnonstop

$259Southwest

Tue, Dec 15 - Sat, Jan 16

6:38 am - 9:44 amSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

2h 06mnonstop

8:16 am - 10:02 amDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

2h 46mnonstop

$259American Airlines

Sat, Dec 5 - Sat, Dec 12

6:48 am - 10:00 amSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

2h 12mnonstop

1:38 pm - 3:17 pmDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

2h 39mnonstop

$259American Airlines

Wed, Jan 20 - Wed, Jan 27

10:36 am - 1:48 pmSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

2h 12mnonstop

8:20 am - 10:08 amDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

2h 48mnonstop

$273American Airlines

Sat, Dec 5 - Mon, Dec 7

8:40 am - 11:35 amSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

1h 55mnonstop

12:15 pm - 1:40 pmDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

2h 25mnonstop

$274Southwest

Sat, Dec 5 - Mon, Dec 7

4:00 pm - 6:55 pmSTL Lambert-St Louis-DCA Washington, D.C. Reagan-National

1h 55mnonstop

12:15 pm - 1:40 pmDCA Washington, D.C. Reagan-National-STL Lambert-St Louis

2h 25mnonstop

$274Southwest

Mon, Dec 7 - Sat, Dec 12

8:22 am - 11:33 amSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

2h 11mnonstop

8:32 am - 10:05 amIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

2h 33mnonstop

$274United Airlines

Mon, Dec 21 - Wed, Dec 30

8:30 am - 11:35 amSTL Lambert-St Louis-IAD Washington, D.C. Dulles Intl

2h 05mnonstop

8:30 am - 10:03 amIAD Washington, D.C. Dulles Intl-STL Lambert-St Louis

2h 33mnonstop

$285United Airlines

Wed, Dec 2 - Tue, Dec 8

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Delta flights from St. Louis to District of Columbia

Our best Delta deals on St. Louis to District of Columbia flight tickets

Delta

Dec 5

STL5:31 pmLambert-St Louis

6h 10m

1 stop

IAD12:41 amWashington, D.C. Dulles Intl

Dec 7

IAD5:02 pmWashington, D.C. Dulles Intl

5h 36m

1 stop

STL9:38 pmLambert-St Louis

$292

Delta

Dec 5

STL6:00 amLambert-St Louis

5h 57m

1 stop

DCA12:57 pmWashington, D.C. Reagan-National

Dec 7

DCA5:34 pmWashington, D.C. Reagan-National

3h 58m

1 stop

STL8:32 pmLambert-St Louis

$294

Delta

Dec 8

STL6:00 amLambert-St Louis

7h 01m

1 stop

IAD2:01 pmWashington, D.C. Dulles Intl

Dec 10

IAD12:38 pmWashington, D.C. Dulles Intl

4h 46m

1 stop

STL4:24 pmLambert-St Louis

$302

Frontier flights from St. Louis to District of Columbia

Our best Frontier deals on St. Louis to District of Columbia flight tickets

Frontier

Dec 3

STL6:13 pmLambert-St Louis

19h 36m

2 stops

IAD2:49 pmWashington, D.C. Dulles Intl

Dec 7

IAD8:26 pmWashington, D.C. Dulles Intl

28h 46m

1 stop

STL12:12 amLambert-St Louis

$258

Frontier

Nov 24

STL5:15 pmLambert-St Louis

10h 55m

1 stop

IAD5:10 amWashington, D.C. Dulles Intl

Nov 30

IAD6:50 amWashington, D.C. Dulles Intl

11h 50m

1 stop

STL5:40 pmLambert-St Louis

$260

Frontier

Dec 7

STL12:02 pmLambert-St Louis

21h 05m

2 stops

IAD10:07 amWashington, D.C. Dulles Intl

Dec 11

IAD10:35 pmWashington, D.C. Dulles Intl

13h 22m

2 stops

STL10:57 amLambert-St Louis

$263

momondo Fare Finder

Use the filters below to find and compare flights from St. Louis to District of Columbia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisWashington, D.C.

STL Lambert-St Louis - IAD Washington, D.C. Dulles Intl

STLIAD

Lambert-St Louis

Thu 12/3

6:13 pm-2:49 pm

2 stops19h 36m

Washington, D.C. Dulles Intl

Mon 12/7

8:26 pm-12:12 am

1 stop28h 46m

$258

St. LouisWashington, D.C.

STL Lambert-St Louis - DCA Washington, D.C. Reagan-National

STLDCA

Lambert-St Louis

Sat 12/5

6:38 am-9:44 am

Nonstop2h 06m

Washington, D.C. Reagan-National

Sat 12/12

8:16 am-10:02 am

Nonstop2h 46m

$259

Quickest round-trip

St. LouisWashington, D.C.

STL Lambert-St Louis - DCA Washington, D.C. Reagan-National

STLDCA

Lambert-St Louis

Tue 12/15

4:00 pm-6:55 pm

Nonstop1h 55m

Washington, D.C. Reagan-National

Sat 1/16

12:00 pm-1:30 pm

Nonstop2h 30m

$259

St. LouisWashington, D.C.

STL Lambert-St Louis - IAD Washington, D.C. Dulles Intl

STLIAD

Lambert-St Louis

Tue 12/15

1:17 pm-4:22 pm

Nonstop2h 05m

Washington, D.C. Dulles Intl

Sat 1/16

8:35 am-10:08 am

Nonstop2h 33m

$259

St. LouisWashington, D.C.

STL Lambert-St Louis - IAD Washington, D.C. Dulles Intl

STLIAD

Lambert-St Louis

Wed 1/20

8:30 am-11:37 am

Nonstop2h 07m

Washington, D.C. Dulles Intl

Wed 1/27

5:55 pm-7:27 pm

Nonstop2h 32m

$259

St. LouisWashington, D.C.

STL Lambert-St Louis - DCA Washington, D.C. Reagan-National

STLDCA

Lambert-St Louis

Wed 1/20

6:48 am-10:00 am

Nonstop2h 12m

Washington, D.C. Reagan-National

Wed 1/27

1:38 pm-3:17 pm

Nonstop2h 39m

$259

St. LouisWashington, D.C.

STL Lambert-St Louis - IAD Washington, D.C. Dulles Intl

STLIAD

Lambert-St Louis

Tue 11/24

5:15 pm-5:10 am

1 stop10h 55m

Washington, D.C. Dulles Intl

Mon 11/30

6:50 am-5:40 pm

1 stop11h 50m

$260

St. LouisWashington, D.C.

STL Lambert-St Louis - DCA Washington, D.C. Reagan-National

STLDCA

Lambert-St Louis

Wed 1/20

6:05 am-11:25 am

1 stop4h 20m

Washington, D.C. Reagan-National

Wed 1/27

12:00 pm-1:30 pm

Nonstop2h 30m

$269

St. LouisWashington, D.C.

STL Lambert-St Louis - IAD Washington, D.C. Dulles Intl

STLIAD

Lambert-St Louis

Fri 12/11

10:14 am-4:23 pm

1 stop5h 09m

Washington, D.C. Dulles Intl

Fri 12/18

11:30 am-5:20 pm

1 stop6h 50m

$278

St. LouisWashington, D.C.

STL Lambert-St Louis - IAD Washington, D.C. Dulles Intl

STLIAD

Lambert-St Louis

Thu 12/10

6:00 am-11:43 am

1 stop4h 43m

Washington, D.C. Dulles Intl

Thu 12/10

7:39 pm-12:05 am

1 stop5h 26m

$278

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 District of Columbia

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 District of Columbia?

In general, December is the cheapest month to fly from St. Louis to District of Columbia. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $336. If you don’t want to visit District of Columbia in December, then you should wait until January to fly from St. Louis, when ticket prices are also cheap, with an average price of $352.

What is the cheapest day to depart on your flight to District of Columbia?

The cheapest day to depart on your flight to District of Columbia is on a Thursday when prices can be found for as low as $413. This is often the case because there is less demand to fly during this day of the week. On the other hand, Monday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $529.

What is the cheapest time of day to depart on your flight to District of Columbia?

Flying to District of Columbia from St. Louis in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $378 when looking at flights departing in the afternoon. Flights to District of Columbia are more costly at noon, with an average ticket price of $560. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Lambert-St Louis to District of Columbia flight route?

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

What cabin class options are available on St. Louis to District of Columbia flights?

There are 4 cabin classes available to choose from on St. Louis to District of Columbia 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 District of Columbia flights?

You could potentially save up to 14% on your flight if you consider stops on a St. Louis to District of Columbia flight.

Cheap St. Louis to District of Columbia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to District of Columbia

Best Price Found	$69
Fastest flight time	1h 55m
Direct flights	Every day
Airports in District of Columbia	2 airports

The best one-way flight to District of Columbia from St. Louis in the past 72 hours is $69. The best round-trip flight deal from St. Louis to District of Columbia found on momondo in the last 72 hours is $258.

The fastest flight from St. Louis to District of Columbia takes 1h 55m

Direct flights go from St. Louis to District of Columbia every day.

There are 2 airports in District of Columbia. From St. Louis there are direct flights to Washington, D.C. Reagan-National (DCA), Washington, D.C. Dulles Intl (IAD).

Search flight deals

Frequently asked questions about flying from St. Louis to District of Columbia

When did momondo last update prices for flights from Lambert-St Louis Airport to District of Columbia?
Prices for flights from Lambert-St Louis Airport to District of Columbia refresh daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to District of Columbia?
As of November 2026, there are 6 operators available to choose from for flights from Lambert-St Louis Airport to District of Columbia.
How old do you have to be to fly from Lambert-St Louis Airport to District of Columbia?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to District of Columbia.
What documentation or ID do you need to fly to District of Columbia?
The travel and health documents you'll need for your trip to District of Columbia may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at District of Columbia. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from St. Louis to District of Columbia?
Based on momondo bookings for flights between St. Louis and District of Columbia, the leading plane model is Embraer 175, making up 23.85% of the total bookings. Other popular models include Boeing 737 MAX 8 with 22.62%, Canadair (Bombardier) Regional Jet CRJ-550 with 15.08%, and Boeing 737-800 Passenger/BBJ2 (winglets) with 11.62%.

Best airlines flying from St. Louis to District of Columbia

Compare and see reviews for airlines that fly from St. Louis to District of Columbia with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $90	Free Cancellation	Rating 5.5 2,507 reviews	Search Frontier flights
JetBlue	PriceFrom $200	Free Cancellation	Rating 7.1 3,064 reviews	Search JetBlue flights
Delta	PriceFrom $203	Free Cancellation	Rating 7.8 8,699 reviews	Search Delta flights
American Airlines	PriceFrom $237	Free Cancellation	Rating 7.0 12,227 reviews	Search American Airlines flights
Southwest	PriceFrom $248	Free Cancellation	Rating 8.0 4,218 reviews	Search Southwest flights
United Airlines	PriceFrom $301	Free Cancellation	Rating 7.3 10,472 reviews	Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to District of Columbia?

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

Can I find flights from St. Louis to District of Columbia with flexible booking policies on momondo?

Flights from St. Louis to District of Columbia with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from St. Louis to District of Columbia?

momondo provides multiple filters to help you find the best flight to District of Columbia from St. Louis. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from St. Louis to District of Columbia right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of St. Louis to District of Columbia flights. All you need is a valid email address and we will do the rest; it is that quick and easy.