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St. Louis

$62+ 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 1/8. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — STL
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
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 December 18, 2025.

This United Airlines deal was found by Cheapflights users on 12/17. 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 12/255:50 pmIAD - STL
Nonstop2h 32mUnited Airlines
Thu 1/18:15 amSTL - IAD
Nonstop2h 09mUnited Airlines
Deal found 12/17$262
This CheapOair deal was found by Cheapflights users on 12/17. 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 12/189:41 amIAD - STL
1 stop23h 31mFrontier
Thu 12/2510:42 amSTL - IAD
1 stop6h 34mFrontier
Deal found 12/17$268
This American Airlines deal was found by Cheapflights users on 12/17. 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.
Thu 12/256:46 amDCA - STL
1 stop4h 13mAmerican Airlines
Thu 1/16:02 amSTL - DCA
Nonstop2h 08mAmerican Airlines
Deal found 12/17$272
This CheapOair deal was found by Cheapflights users on 12/15. 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.
Tue 12/306:00 pmDCA - STL
1 stop17h 02mFrontier
Wed 1/77:43 pmSTL - DCA
1 stop20h 16mFrontier
Deal found 12/15$293
This CheapOair deal was found by Cheapflights users on 12/17. 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 12/189:41 amIAD - STL
1 stop23h 31mFrontier
Mon 12/229:07 amSTL - IAD
1 stop23h 21mFrontier
Deal found 12/17$294
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/255:50 pmIAD - STL
Nonstop2h 32mUnited Airlines
Wed 12/313:10 pmSTL - IAD
1 stop5h 11mUnited Airlines
Deal found 12/16$307
This Southwest deal was found by Cheapflights users on 12/17. 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.
Thu 12/256:10 amDCA - STL
1 stop7h 50mSouthwest
Wed 12/317:00 pmSTL - DCA
Nonstop1h 55mSouthwest
Deal found 12/17$307
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/256:00 pmDCA - STL
1 stop4h 43mUnited Airlines
Wed 12/315:02 pmSTL - DCA
1 stop5h 57mUnited Airlines
Deal found 12/17$317
This Trip.com deal was found by Cheapflights users on 12/16. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/252:00 pmDCA - STL
1 stop21h 02mFrontier
Mon 1/57:43 pmSTL - DCA
1 stop16h 19mFrontier
Deal found 12/16$321
This American Airlines deal was found by Cheapflights users on 12/16. 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.
Thu 12/256:46 amDCA - STL
1 stop4h 13mAmerican Airlines
Wed 12/316:02 amSTL - DCA
Nonstop2h 08mAmerican Airlines
Deal found 12/16$323
This Kiwi.com deal was found by Cheapflights users on 12/15. 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.
Wed 12/316:05 amIAD - STL
2 stops17h 28mFrontier
Sun 1/410:57 amSTL - IAD
1 stop23h 41mFrontier
Deal found 12/15$337
This Trip.com deal was found by Cheapflights users on 12/16. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/299:58 pmIAD - STL
1 stop25h 35mFrontier
Fri 1/29:07 amSTL - IAD
1 stop22h 44mFrontier
Deal found 12/16$341

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 December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$260
(Kiwi.com)

One-way from

$62
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$388

Good round-trip deal

$340 or less

Good one-way deal

$173 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. 10% potential increase in price ($36 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 18, 2025.
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

Tue 1/13

8:40 am-10:13 am

Nonstop2h 33m

Lambert-St Louis

Wed 1/14

11:20 am-5:35 pm

1 stop5h 15m

$274

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 1/29

6:05 am-9:39 am

1 stop4h 34m

Lambert-St Louis

Tue 2/3

6:00 am-11:20 am

1 stop4h 20m

$285

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Wed 1/21

6:05 am-9:39 am

1 stop4h 34m

Lambert-St Louis

Mon 1/26

3:45 pm-9:34 pm

1 stop4h 49m

$285

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 1/24

1:04 pm-4:37 pm

1 stop4h 33m

Lambert-St Louis

Thu 1/29

12:00 pm-4:58 pm

1 stop3h 58m

$285

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Fri 1/16

5:17 pm-10:58 pm

1 stop6h 41m

Lambert-St Louis

Sun 1/18

6:30 am-11:46 am

1 stop4h 16m

$292

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sun 1/18

6:05 am-9:39 am

1 stop4h 34m

Lambert-St Louis

Fri 1/23

6:00 am-11:20 am

1 stop4h 20m

$292

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Tue 1/6

9:05 am-5:30 pm

1 stop9h 25m

Lambert-St Louis

Mon 1/12

12:25 pm-9:55 pm

1 stop8h 30m

$293

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 1/8

1:40 pm-5:50 pm

1 stop5h 10m

Lambert-St Louis

Tue 1/13

12:00 pm-5:00 pm

1 stop4h 00m

$293

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Wed 1/7

7:30 pm-11:39 pm

1 stop5h 09m

Lambert-St Louis

Mon 1/12

3:45 pm-9:34 pm

1 stop4h 49m

$293

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 1/19

7:40 am-9:24 am

Nonstop2h 44m

Lambert-St Louis

Mon 1/26

5:59 pm-9:10 pm

Nonstop2h 11m

$295

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 42 results
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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 $222). 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 December 18, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 24% 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 December 13, 2025.

Travelers seeking maximum savings on their District of Columbia to St. Louis flight should consider departing on Tuesday 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.

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 33m. Fly via United Airlines, Delta, or Southwest 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 (72%), Avianca (72%) or Copa Airlines (72%) 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 $66. While the most popular route (Washington, D.C. Dulles Intl - Lambert-St Louis) can be booked for $188 on average, our data indicates $405 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 $222). 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
Fairview Heights
Maryland Heights
Collinsville
Swansea
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

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Alternative routes for District of Columbia to St. Louis

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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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$198FlexibilityNo cancel feeOn-time62%
DeltaCheapest$130Average$279FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$172Average$329FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$187Average$353FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$223Average$396FlexibilityNo cancel feeOn-time69%

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