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St. Louis

$59+ Cheap flights from District of Columbia to St. Louis (STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/11. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — STL
Mar 2 — Mar 91
Mon 3/2
Mon 3/9
1 adult, Economy
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Cheap flight deals from District of Columbia to St. Louis

Cheapest flights from District of Columbia to St. Louis
Explore the most affordable flight options available from District of Columbia to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 31, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/39:51 am
IAD
-
STL
1 stop21h 59m
Frontier
Wed 5/64:55 pm
STL
-
IAD
1 stop13h 32m
Frontier
Deal found 1/29$254
This Mytrip deal was found by Cheapflights users on 1/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/102:00 pm
DCA
-
STL
1 stop24h 58m
Frontier
Wed 4/88:16 pm
STL
-
DCA
1 stop24h 43m
Frontier
Deal found 1/30$254
This Kiwi.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/155:39 pm
IAD
-
STL
1 stop14h 12m
Frontier
Thu 2/193:49 pm
STL
-
IAD
1 stop14h 31m
Frontier
Deal found 1/28$255
This American Airlines deal was found by Cheapflights users on 1/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/42:14 pm
DCA
-
STL
1 stop7h 02m
American Airlines
Wed 3/186:00 am
STL
-
DCA
Nonstop2h 12m
American Airlines
Deal found 1/30$255
This American Airlines deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/45:00 am
IAD
-
STL
1 stop5h 40m
American Airlines
Sat 3/77:05 am
STL
-
IAD
1 stop5h 27m
American Airlines
Deal found 1/31$256
This Kiwi.com deal was found by Cheapflights users on 1/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/2810:29 am
IAD
-
STL
2 stops14h 30m
Frontier
Thu 3/53:49 pm
STL
-
IAD
1 stop14h 35m
Frontier
Deal found 1/30$257
This American Airlines deal was found by Cheapflights users on 1/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/101:45 pm
DCA
-
STL
Nonstop2h 34m
American Airlines
Wed 3/116:00 am
STL
-
DCA
Nonstop2h 12m
American Airlines
Deal found 1/30$257
This Southwest deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/214:25 pm
DCA
-
STL
1 stop6h 25m
Southwest
Tue 2/2410:15 am
STL
-
DCA
2 stops6h 45m
Southwest
Deal found 1/29$258
This CheapOair deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/510:10 am
IAD
-
STL
1 stop14h 49m
Frontier
Sun 3/87:52 am
STL
-
IAD
1 stop22h 32m
Frontier
Deal found 1/29$259
This Kiwi.com deal was found by Cheapflights users on 1/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/222:00 pm
DCA
-
STL
1 stop24h 09m
Frontier
Tue 2/243:49 pm
STL
-
DCA
2 stops20h 26m
Frontier
Deal found 1/30$259
This Kiwi.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/38:30 pm
IAD
-
STL
1 stop12h 21m
Frontier
Mon 4/64:54 pm
STL
-
IAD
1 stop23h 37m
Frontier
Deal found 1/28$260
This United Airlines deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/198:40 am
IAD
-
STL
Nonstop2h 33m
United Airlines
Sat 2/2112:15 pm
STL
-
IAD
Nonstop2h 12m
United Airlines
Deal found 1/29$262

Find flight deals from District of Columbia to St. Louis

Keep the following information in mind while searching for District of Columbia to St. Louis flight deals. Data was last updated January 31, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$254
(Kiwi.com)

One-way from

$59
(WAYA)

Popular in

January

Cheapest in

August

Average price

$468

Good round-trip deal

$305 or less

Good one-way deal

$148 or less
Provider with most accurate pricing for Washington, D.C. (WAS)-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Lambert-St Louis flights.
Search Deals
From District of Columbia to Lambert-St Louis
Search Deals
One-way flight from District of Columbia to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($66 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from District of Columbia to Lambert-St Louis.
Search Deals
Price to beat on a one-way flight from District of Columbia to Lambert-St Louis.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from District of Columbia 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, Cheapflights users made 2,558,603 searches. Data last updated January 31, 2026.
Use the filters below to find and compare flights from District of Columbia to St. Louis that are best for you.

Fly from

District of Columbia

Fly to

St. Louis

Route

Depart

Return

Price

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Wed 3/4

6:45 pm-8:23 pm

Nonstop2h 38m

Lambert-St Louis

Wed 3/18

7:00 pm-11:59 pm

1 stop3h 59m

$255

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 2/21

4:25 pm-9:50 pm

1 stop6h 25m

Lambert-St Louis

Tue 2/24

10:15 am-6:00 pm

2 stops6h 45m

$258

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Wed 3/4

6:00 am-11:02 am

1 stop6h 02m

Lambert-St Louis

Wed 3/18

6:59 pm-12:27 am

1 stop4h 28m

$265

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Fri 4/17

6:00 pm-7:12 pm

1 stop26h 12m

Lambert-St Louis

Mon 4/20

8:12 pm-9:59 pm

1 stop24h 47m

$266

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 2/21

3:40 pm-8:00 pm

1 stop5h 20m

Lambert-St Louis

Mon 2/23

8:25 am-11:20 am

Nonstop1h 55m

$272

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Wed 3/4

8:40 am-10:13 am

Nonstop2h 33m

Lambert-St Louis

Sat 3/7

7:41 am-4:09 pm

1 stop7h 28m

$274

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 4/23

2:45 pm-4:05 pm

Nonstop2h 20m

Lambert-St Louis

Tue 4/28

3:40 pm-6:40 pm

Nonstop2h 00m

$274

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Fri 4/3

8:30 pm-7:51 am

1 stop12h 21m

Lambert-St Louis

Mon 4/6

4:54 pm-5:31 pm

1 stop23h 37m

$275

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 4/2

7:30 am-9:06 am

Nonstop2h 36m

Lambert-St Louis

Tue 4/7

6:00 am-9:15 am

Nonstop2h 15m

$276

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 3/31

6:00 am-11:09 am

1 stop6h 09m

Lambert-St Louis

Wed 4/15

4:41 pm-10:31 pm

1 stop4h 50m

$277

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/31

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Best time to book a flight from District of Columbia to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from District of Columbia with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from District of Columbia to St. Louis

What is the cheapest month to book a flight from District of Columbia to St. Louis?

Currently, September is the cheapest month in which you can book a flight from District of Columbia to St. Louis (average of $109). Flying from District of Columbia to St. Louis in January is currently the most expensive (average of $229). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from DC to STL?

Find hourly flight availability from District of Columbia to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 31, 2026.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 27% on flights from District of Columbia to St. Louis by exploring options for tickets in the evening.

What is the cheapest day to fly from District of Columbia to St. Louis?

Use this chart to determine the cheapest time to fly round-trip from District of Columbia to St. Louis. Price data was last updated on January 31, 2026.

Travelers seeking maximum savings on their District of Columbia to St. Louis flight should consider departing on Friday evenings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from District of Columbia to St. Louis

Explore weekly flight availability from District of Columbia to St. Louis. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated January 31, 2026.

The most flights from USDC to STL are scheduled on a Monday (8 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (3 on average).

Related info for your journey

Find useful and relevant information for your journey from District of Columbia to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to St. Louis from District of Columbia?

    Located just 12.7 mi from the city center, Lambert-St Louis (STL) is the airport most travelers will use when flying to St. Louis from District of Columbia.

  • How long is the flight from District of Columbia to St. Louis?

    There are many flights that can get you from District of Columbia to St. Louis in 2h 38m. Fly via United Airlines, Southwest, or Delta to get the fastest option. Airlines will cover a distance of 694 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from District of Columbia to St. Louis one-way?

    One-way options have recently been found by users for as low as $55 on Frontier. Other airlines that offer cheap prices include Southwest from $88 and American Airlines from $98 one-way.

  • What are the most reliable airlines from District of Columbia to St. Louis?

    No one likes to see their flight delayed. When booking a flight from District of Columbia to St. Louis consider choosing GoJet (76%), United Airlines (76%) or Avianca (64%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from District of Columbia to St. Louis?

    Looking at all options, your cheapest flight can be booked for $113. While the most popular route (Washington, D.C. Dulles Intl - Lambert-St Louis) can be booked for $172 on average, our data indicates $516 when flying from District of Columbia to St. Louis.

  • Can I find deals for flights from District of Columbia to St. Louis that include hotel bookings?

    Yes. In addition to deals on District of Columbia to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from District of Columbia to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from District of Columbia to St. Louis.

  • Can I find deals for business class flights from District of Columbia to St. Louis?

    Yes. Cheapflights offers flight deals from District of Columbia to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from District of Columbia to St. Louis?

    Currently, September is the cheapest month in which you can book a flight from District of Columbia to St. Louis (average of $109). Flying from District of Columbia to St. Louis in January is currently the most expensive (average of $229). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
Chesterfield
Alton
Farmington
Festus

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Alternative routes for District of Columbia to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from District of Columbia to St. Louis

Discover the top 5 airlines that operate flights from District of Columbia to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 31, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$197FlexibilityNo cancel feeOn-time62%
DeltaCheapest$124Average$288FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$167Average$314FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$185Average$358FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$233Average$455FlexibilityNo cancel feeOn-time69%

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