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Cheap flights from St. Louis to District of Columbia from $70

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 9/6. 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

American Airlines Logo
6:00 pm - 9:00 pmSTL-DCA
2h 00mnonstop
American Airlines Logo
2:56 pm - 4:15 pmDCA-STL
2h 19mnonstop
$139American Airlines
Find Deal
Wed, Sep 10 - Sat, Sep 13
American Airlines Logo
6:02 am - 9:03 amSTL-DCA
2h 01mnonstop
American Airlines Logo
2:56 pm - 4:14 pmDCA-STL
2h 18mnonstop
$156American Airlines
Find Deal
Wed, Aug 27 - Thu, Aug 28
Southwest Logo
1:40 pm - 4:40 pmSTL-DCA
2h 00mnonstop
Southwest Logo
12:00 pm - 1:20 pmDCA-STL
2h 20mnonstop
$164Southwest
Find Deal
Sat, Oct 18 - Tue, Oct 21
Southwest Logo
3:55 pm - 6:50 pmSTL-DCA
1h 55mnonstop
Southwest Logo
6:00 am - 9:45 amDCA-STL
4h 45m1 stop
$166Southwest
Find Deal
Thu, Nov 6 - Sat, Nov 8
United Airlines Logo
5:30 pm - 12:32 amSTL-IAD
6h 02m1 stop
United Airlines Logo
8:40 am - 10:02 amIAD-STL
2h 22mnonstop
$166United Airlines
Find Deal
Sat, Aug 30 - Sat, Sep 6
United Airlines Logo
6:35 am - 2:37 pmSTL-IAD
7h 02m1 stop
United Airlines Logo
8:40 am - 10:02 amIAD-STL
2h 22mnonstop
$183United Airlines
Find Deal
Wed, Aug 27 - Sun, Aug 31
Delta Logo
10:45 am - 5:34 pmSTL-IAD
5h 49m1 stop
Delta Logo
7:22 pm - 11:24 pmIAD-STL
5h 02m1 stop
$197Delta
Find Deal
Fri, Sep 5 - Fri, Sep 12
Frontier Logo
3:02 pm - 11:00 pmSTL-IAD
6h 58m1 stop
Frontier Logo
6:10 am - 12:56 pmIAD-STL
7h 46m1 stop
$208Frontier
Find Deal
Sat, Aug 30 - Mon, Sep 1
Frontier Logo
2:52 pm - 11:26 pmSTL-IAD
7h 34m1 stop
Frontier Logo
9:33 pm - 2:21 pmIAD-STL
17h 48m1 stop
$215Frontier
Find Deal
Sat, Aug 16 - Sun, Aug 24
Delta Logo
4:10 pm - 11:04 pmSTL-DCA
5h 54m1 stop
Delta Logo
1:45 pm - 6:02 pmDCA-STL
5h 17m1 stop
$219Delta
Find Deal
Thu, Oct 23 - Sat, Oct 25

United Airlines flights from St. Louis to District of Columbia

Our best United Airlines deals on St. Louis to District of Columbia flight tickets
United Airlines
Aug 30
STL5:30 pmLambert-St Louis
6h 02m
1 stop
IAD12:32 amWashington, D.C. Dulles Intl
Sep 6
IAD8:40 amWashington, D.C. Dulles Intl
2h 22m
STL10:02 amLambert-St Louis
$166
Find similar
United Airlines
Aug 27
STL6:35 amLambert-St Louis
7h 02m
1 stop
IAD2:37 pmWashington, D.C. Dulles Intl
Aug 31
IAD8:40 amWashington, D.C. Dulles Intl
2h 22m
STL10:02 amLambert-St Louis
$183
Find similar
United Airlines
Sep 27
STL6:30 amLambert-St Louis
6h 21m
1 stop
IAD1:51 pmWashington, D.C. Dulles Intl
Oct 1
IAD6:50 pmWashington, D.C. Dulles Intl
4h 45m
1 stop
STL10:35 pmLambert-St Louis
$193
Find similar

Delta flights from St. Louis to District of Columbia

Our best Delta deals on St. Louis to District of Columbia flight tickets
Delta
Sep 5
STL10:45 amLambert-St Louis
5h 49m
1 stop
IAD5:34 pmWashington, D.C. Dulles Intl
Sep 12
IAD7:22 pmWashington, D.C. Dulles Intl
5h 02m
1 stop
STL11:24 pmLambert-St Louis
$197
Find similar
Delta
Sep 16
STL6:00 pmLambert-St Louis
4h 06m
1 stop
IAD11:06 pmWashington, D.C. Dulles Intl
Sep 17
IAD12:08 pmWashington, D.C. Dulles Intl
5h 40m
1 stop
STL4:48 pmLambert-St Louis
$219
Find similar
Delta
Aug 27
STL6:00 amLambert-St Louis
4h 23m
1 stop
IAD11:23 amWashington, D.C. Dulles Intl
Aug 28
IAD6:00 amWashington, D.C. Dulles Intl
4h 15m
1 stop
STL9:15 amLambert-St Louis
$237
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 August 5, 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 - DCA

STLDCA

Lambert-St Louis

Wed 9/10

6:00 pm-9:00 pm

Nonstop2h 00m

Washington, D.C. Reagan-National

Sat 9/13

2:56 pm-4:15 pm

Nonstop2h 19m

$139

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 8/27

6:02 am-9:03 am

Nonstop2h 01m

Washington, D.C. Reagan-National

Thu 8/28

2:56 pm-4:14 pm

Nonstop2h 18m

$156

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 10/18

1:40 pm-4:40 pm

Nonstop2h 00m

Washington, D.C. Reagan-National

Tue 10/21

12:00 pm-1:20 pm

Nonstop2h 20m

$164

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 11/6

3:55 pm-6:50 pm

Nonstop1h 55m

Washington, D.C. Reagan-National

Sat 11/8

6:00 am-9:45 am

1 stop4h 45m

$166

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sat 8/30

5:30 pm-12:32 am

1 stop6h 02m

Washington, D.C. Dulles Intl

Sat 9/6

8:40 am-10:02 am

Nonstop2h 22m

$166

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Wed 8/27

6:35 am-2:37 pm

1 stop7h 02m

Washington, D.C. Dulles Intl

Sun 8/31

8:40 am-10:02 am

Nonstop2h 22m

$183

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Fri 9/5

10:45 am-5:34 pm

1 stop5h 49m

Washington, D.C. Dulles Intl

Fri 9/12

7:22 pm-11:24 pm

1 stop5h 02m

$197

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sat 8/30

3:02 pm-11:00 pm

1 stop6h 58m

Washington, D.C. Dulles Intl

Mon 9/1

6:10 am-12:56 pm

1 stop7h 46m

$208

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sat 8/16

2:52 pm-11:26 pm

1 stop7h 34m

Washington, D.C. Dulles Intl

Sun 8/24

9:33 pm-2:21 pm

1 stop17h 48m

$215

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 10/23

4:10 pm-11:04 pm

1 stop5h 54m

Washington, D.C. Reagan-National

Sat 10/25

1:45 pm-6:02 pm

1 stop5h 17m

$219

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 November to fly from St. Louis, when ticket prices are also cheap, with an average price of $229.

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 $365. This is often the case because there is less demand to fly during this day of the week. On the other hand, Saturday 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 $479.

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 $283 when looking at flights departing in the evening. Flights to District of Columbia are more costly at noon, with an average ticket price of $970. 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 $323 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 $239 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?

No. A direct flight is the cheapest option for a flight between St. Louis to District of Columbia.

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

$70

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 $70. The best round-trip flight deal from St. Louis to District of Columbia found on momondo in the last 72 hours is $139.
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 near District of Columbia: 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 $124Free CancellationRating
5.8
3,232 reviews
Search Frontier flights
American AirlinesPriceFrom $129Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $168Free CancellationRating
8.0
7,985 reviews
Search Delta flights
SouthwestPriceFrom $190Free CancellationRating
8.0
4,246 reviews
Search Southwest flights
United AirlinesPriceFrom $209Free CancellationRating
7.4
8,916 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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