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$55+ 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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — STL
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
1 adult, Economy
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Find 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 November 3, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/1. 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.
Mon 12/112:47 pmIAD - STL
2 stops46h 27mFrontier
Mon 12/810:47 amSTL - IAD
1 stop5h 38mFrontier
Deal found 11/1$225
This Kiwi.com deal was found by Cheapflights users on 11/1. 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 11/146:00 amIAD - STL
1 stop11h 01mFrontier
Sun 11/162:12 pmSTL - IAD
1 stop28h 40mFrontier
Deal found 11/1$229
This Priceline deal was found by Cheapflights users on 11/2. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/136:00 amIAD - STL
1 stop5h 12mFrontier
Fri 11/1411:05 amSTL - IAD
1 stop7h 46mFrontier
Deal found 11/2$231
This Kiwi.com deal was found by Cheapflights users on 11/2. 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 11/166:00 amIAD - STL
1 stop5h 12mFrontier
Tue 11/187:45 pmSTL - IAD
2 stops23h 35mFrontier
Deal found 11/2$235
This Kiwi.com deal was found by Cheapflights users on 11/3. 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.
Tue 11/188:40 amIAD - STL
2 stops25h 27mFrontier
Thu 11/204:13 pmSTL - IAD
1 stop14h 37mFrontier
Deal found 11/3$236
This FlightHub deal was found by Cheapflights users on 11/2. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/116:00 pmDCA - STL
1 stop16h 07mFrontier
Mon 11/247:43 pmSTL - DCA
1 stop25h 16mFrontier
Deal found 11/2$240
This Kiwi.com deal was found by Cheapflights users on 11/2. 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.
Mon 12/18:40 amIAD - STL
1 stop16h 17mFrontier
Fri 12/1210:42 amSTL - IAD
1 stop4h 42mFrontier
Deal found 11/2$241
This eDestinos deal was found by Cheapflights users on 11/3. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/198:40 amIAD - STL
1 stop15h 21mFrontier
Sun 11/234:13 pmSTL - IAD
1 stop14h 32mFrontier
Deal found 11/3$243
This Kiwi.com deal was found by Cheapflights users on 11/2. 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.
Thu 12/46:00 pmDCA - STL
2 stops18h 22mFrontier
Mon 12/87:43 pmSTL - DCA
1 stop16h 23mFrontier
Deal found 11/2$249
This Booking.com deal was found by Cheapflights users on 11/1. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/48:00 amDCA - STL
1 stop26h 07mFrontier
Wed 11/57:45 pmSTL - DCA
1 stop16h 17mFrontier
Deal found 11/1$253
This Kiwi.com deal was found by Cheapflights users on 11/2. 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 12/129:26 amIAD - STL
2 stops25h 48mFrontier
Mon 12/1510:47 amSTL - IAD
1 stop5h 38mFrontier
Deal found 11/2$254
This Kiwi.com deal was found by Cheapflights users on 11/3. 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.
Mon 11/176:00 amIAD - STL
2 stops28h 07mFrontier
Wed 11/197:24 pmSTL - IAD
1 stop13h 53mFrontier
Deal found 11/3$259

Cheap 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 November 3, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$227
(Southwest)

One-way from

$55
(Priceline)

Popular in

October

Cheapest in

August

Average price

$334

Good round-trip deal

$311 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. 4% potential increase in price ($15 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 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 November 3, 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

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Wed 12/3

8:15 am-9:35 am

Nonstop2h 20m

Lambert-St Louis

Wed 12/10

7:00 pm-9:55 pm

Nonstop1h 55m

$263

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 12/2

2:45 pm-4:05 pm

Nonstop2h 20m

Lambert-St Louis

Tue 12/9

1:50 pm-8:30 pm

1 stop5h 40m

$273

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Fri 2/20

6:00 am-10:58 am

1 stop5h 58m

Lambert-St Louis

Wed 2/25

6:30 am-11:49 am

1 stop4h 19m

$283

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 12/6

11:25 am-9:00 pm

2 stops10h 35m

Lambert-St Louis

Mon 12/8

8:45 am-11:40 am

Nonstop1h 55m

$296

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 12/6

8:40 am-10:07 am

Nonstop2h 27m

Lambert-St Louis

Sun 12/7

3:13 pm-9:18 pm

1 stop5h 05m

$322

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Fri 12/5

8:20 am-12:15 pm

1 stop4h 55m

Lambert-St Louis

Sat 12/6

12:55 pm-4:05 pm

Nonstop2h 10m

$322

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 1/15

8:40 am-10:13 am

Nonstop2h 33m

Lambert-St Louis

Mon 1/19

6:30 am-11:46 am

1 stop4h 16m

$322

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 1/15

3:30 pm-8:00 pm

1 stop5h 30m

Lambert-St Louis

Mon 1/19

9:50 am-6:00 pm

2 stops7h 10m

$324

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Fri 1/2

8:14 pm-9:45 pm

Nonstop2h 31m

Lambert-St Louis

Mon 1/5

4:53 pm-11:59 pm

1 stop6h 06m

$325

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Wed 12/24

2:45 pm-4:05 pm

Nonstop2h 20m

Lambert-St Louis

Mon 12/29

5:20 am-1:00 pm

2 stops6h 40m

$327

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/2

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 $199). 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 November 3, 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 November 2, 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.

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 November 3, 2025.

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

How much does it cost to fly round-trip from District of Columbia to St. Louis?

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 20m. Fly via Southwest or United Airlines to get the fastest option. Airlines will cover a distance of 717 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 $79 on Frontier. Other airlines that offer cheap prices include United Airlines from $132 and Southwest from $137 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 (86%), Avianca (86%) or United Airlines (86%) 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 $134. While the most popular route (Washington, D.C. Dulles Intl - Lambert-St Louis) can be booked for $128 on average, our data indicates $301 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 $199). 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
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 November 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$112Average$197FlexibilityNo cancel feeOn-time62%
DeltaCheapest$130Average$280FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$172Average$329FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$188Average$349FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$223Average$401FlexibilityNo cancel feeOn-time69%

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