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Cheap flights from St. Louis to District of Columbia from $64

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 District of Columbia departing on 1/26. 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 St. Louis to District of Columbia

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
10:42 am - 6:43 pm
STL
-
IAD
7h 01m1 stop
Frontier Logo
9:58 pm - 7:13 am
IAD
-
STL
10h 15m1 stop
$204Frontier
Tue, Apr 7 - Thu, Apr 9
Frontier Logo
3:46 pm - 1:02 pm
STL
-
DCA
20h 16m1 stop
Frontier Logo
8:59 am - 9:06 pm
DCA
-
STL
37h 07m2 stops
$206Frontier
Wed, Jan 21 - Wed, Feb 4
Frontier Logo
7:43 pm - 1:01 pm
STL
-
DCA
16h 18m1 stop
Frontier Logo
6:00 pm - 10:02 am
DCA
-
STL
17h 02m1 stop
$210Frontier
Sat, Jan 10 - Sun, Jan 11
Frontier Logo
5:42 pm - 8:40 am
STL
-
IAD
13h 58m1 stop
Frontier Logo
5:37 pm - 6:51 am
IAD
-
STL
14h 14m1 stop
$210Frontier
Thu, Jan 22 - Sun, Jan 25
Multiple Airlines Logo
9:43 pm - 9:55 am
STL
-
IAD
35h 12m2 stops
Multiple Airlines Logo
5:33 pm - 6:51 am
IAD
-
STL
14h 18m1 stop
$221Multiple Airlines
Fri, Jan 23 - Fri, Jan 30
Multiple Airlines Logo
5:42 pm - 2:18 pm
STL
-
IAD
19h 36m2 stops
Multiple Airlines Logo
5:37 pm - 6:51 am
IAD
-
STL
14h 14m1 stop
$226Multiple Airlines
Thu, Jan 22 - Sun, Jan 25
Southwest Logo
1:10 pm - 4:10 pm
STL
-
DCA
2h 00mnonstop
Southwest Logo
8:15 am - 9:35 am
DCA
-
STL
2h 20mnonstop
$227Southwest
Thu, Dec 25 - Wed, Dec 31
American Airlines Logo
6:02 am - 9:10 am
STL
-
DCA
2h 08mnonstop
American Airlines Logo
7:40 am - 9:24 am
DCA
-
STL
2h 44mnonstop
$231American Airlines
Thu, Jan 1 - Sat, Jan 10
United Airlines Logo
8:15 am - 11:24 am
STL
-
IAD
2h 09mnonstop
United Airlines Logo
8:40 am - 10:13 am
IAD
-
STL
2h 33mnonstop
$231United Airlines
Thu, Jan 1 - Sat, Jan 10
United Airlines Logo
8:30 am - 11:40 am
STL
-
IAD
2h 10mnonstop
United Airlines Logo
5:50 pm - 7:27 pm
IAD
-
STL
2h 37mnonstop
$235United Airlines
Wed, Jan 21 - Wed, Jan 21

American Airlines flights from St. Louis to District of Columbia

Our best American Airlines deals on St. Louis to District of Columbia flight tickets
American Airlines
Jan 1
STL6:02 amLambert-St Louis
2h 08m
DCA9:10 amWashington, D.C. Reagan-National
Jan 10
DCA7:40 amWashington, D.C. Reagan-National
2h 44m
STL9:24 amLambert-St Louis
$231
Find similar
American Airlines
Jan 1
STL6:02 amLambert-St Louis
2h 08m
DCA9:10 amWashington, D.C. Reagan-National
Jan 7
DCA5:55 amWashington, D.C. Reagan-National
4h 45m
1 stop
STL9:40 amLambert-St Louis
$241
Find similar
American Airlines
Jan 7
STL11:27 amLambert-St Louis
5h 22m
1 stop
DCA5:49 pmWashington, D.C. Reagan-National
Jan 10
DCA6:00 amWashington, D.C. Reagan-National
5h 20m
1 stop
STL10:20 amLambert-St Louis
$255
Find similar

Frontier flights from St. Louis to District of Columbia

Our best Frontier deals on St. Louis to District of Columbia flight tickets
Frontier
Apr 7
STL10:42 amLambert-St Louis
7h 01m
1 stop
IAD6:43 pmWashington, D.C. Dulles Intl
Apr 9
IAD9:58 pmWashington, D.C. Dulles Intl
10h 15m
1 stop
STL7:13 amLambert-St Louis
$204
Find similar
Frontier
Jan 21
STL3:46 pmLambert-St Louis
20h 16m
1 stop
DCA1:02 pmWashington, D.C. Reagan-National
Feb 4
DCA8:59 amWashington, D.C. Reagan-National
37h 07m
2 stops
STL9:06 pmLambert-St Louis
$206
Find similar
Frontier
Feb 2
STL1:40 pmLambert-St Louis
7h 19m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
Feb 5
DCA2:00 pmWashington, D.C. Reagan-National
29h 44m
1 stop
STL6:44 pmLambert-St Louis
$207
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to District of Columbia 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 11, 2025.
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

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Tue 4/7

10:42 am-6:43 pm

1 stop7h 01m

Washington, D.C. Dulles Intl

Thu 4/9

9:58 pm-7:13 am

1 stop10h 15m

$204

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 1/21

3:46 pm-1:02 pm

1 stop20h 16m

Washington, D.C. Reagan-National

Wed 2/4

8:59 am-9:06 pm

2 stops37h 07m

$206

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 1/10

7:43 pm-1:01 pm

1 stop16h 18m

Washington, D.C. Reagan-National

Sun 1/11

6:00 pm-10:02 am

1 stop17h 02m

$210

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Thu 1/22

5:42 pm-8:40 am

1 stop13h 58m

Washington, D.C. Dulles Intl

Sun 1/25

5:37 pm-6:51 am

1 stop14h 14m

$210

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Fri 1/23

9:43 pm-9:55 am

2 stops35h 12m

Washington, D.C. Dulles Intl

Fri 1/30

5:33 pm-6:51 am

1 stop14h 18m

$221

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Thu 1/22

5:42 pm-2:18 pm

2 stops19h 36m

Washington, D.C. Dulles Intl

Sun 1/25

5:37 pm-6:51 am

1 stop14h 14m

$226

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 12/25

1:10 pm-4:10 pm

Nonstop2h 00m

Washington, D.C. Reagan-National

Wed 12/31

8:15 am-9:35 am

Nonstop2h 20m

$227

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 1/1

6:02 am-9:10 am

Nonstop2h 08m

Washington, D.C. Reagan-National

Sat 1/10

7:40 am-9:24 am

Nonstop2h 44m

$231

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Thu 1/1

8:15 am-11:24 am

Nonstop2h 09m

Washington, D.C. Dulles Intl

Sat 1/10

8:40 am-10:13 am

Nonstop2h 33m

$231

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Wed 1/21

8:30 am-11:40 am

Nonstop2h 10m

Washington, D.C. Dulles Intl

Wed 1/21

5:50 pm-7:27 pm

Nonstop2h 37m

$235

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 District of Columbia from

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

What is the cheapest month to fly to District of Columbia?

In general, August 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 $229. If you don’t want to visit District of Columbia in August, then you should wait until October to fly from St. Louis, when ticket prices are also cheap, with an average price of $255.

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 Friday when prices can be found for as low as $360. This is often the case because there is less demand to fly during this day of the week. On the other hand, Sunday 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 $497.

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 evening is the least expensive time of day to depart. momondo users have found prices as low as $295 when looking at flights departing in the evening. Flights to District of Columbia are more costly at noon, with an average ticket price of $914. 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

How far in advance should I book a flight to District of Columbia?

You are more likely to see cheaper flights to District of Columbia from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to District of Columbia for around $372 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to District of Columbia from St. Louis for as low as $212 on momondo.

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

There are 4 cabin classes available to choose from on Lambert-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 26% 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

$167

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 $167. The best round-trip flight deal from St. Louis to District of Columbia found on momondo in the last 72 hours is $296.
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

  • 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?

  • 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?

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
FrontierPriceFrom $113Free CancellationRating
5.8
3,084 reviews
Search Frontier flights
DeltaPriceFrom $124Free CancellationRating
7.9
8,008 reviews
Search Delta flights
American AirlinesPriceFrom $177Free CancellationRating
7.2
11,050 reviews
Search American Airlines flights
SouthwestPriceFrom $197Free CancellationRating
7.9
4,253 reviews
Search Southwest flights
United AirlinesPriceFrom $261Free CancellationRating
7.4
9,095 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.

An easier way to manage your District of Columbia trip

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