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District of Columbia

$62+ Cheap flights from St. Louis (STL) to District of Columbia

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.
STL — IAD
mar. 8 — mar. 151
dom. 3/8
dom. 3/15
1 adult, Economy
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Cheap flight deals from St. Louis to District of Columbia

Cheapest flights from St. Louis to District of Columbia
Explore the most affordable flight options available from St. Louis to District of Columbia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on febrero 6, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/4. 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.
jue. 3/510:11 pm
STL
-
DCA
2 stops13h 51m
Frontier
dom. 3/86:00 pm
DCA
-
STL
1 stop16h 49m
Frontier
Deal found 2/4$280
This Kiwi.com deal was found by Cheapflights users on 2/5. 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.
jue. 2/2610:11 pm
STL
-
DCA
2 stops13h 49m
Frontier
mar. 3/32:00 pm
DCA
-
STL
1 stop26h 53m
Frontier
Deal found 2/5$281
This Kiwi.com deal was found by Cheapflights users on 2/4. 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.
mié. 3/45:18 pm
STL
-
DCA
1 stop18h 57m
Frontier
lun. 3/96:00 pm
DCA
-
STL
2 stops26h 11m
Frontier
Deal found 2/4$282
This Kiwi.com deal was found by Cheapflights users on 2/4. 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.
vie. 3/64:21 pm
STL
-
IAD
1 stop14h 03m
Frontier
dom. 3/158:15 am
IAD
-
STL
2 stops30h 19m
Frontier
Deal found 2/4$282
This Gotogate deal was found by Cheapflights users on 2/5. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 2/142:51 pm
STL
-
DCA
1 stop21h 24m
Frontier
mar. 2/172:00 pm
DCA
-
STL
1 stop26h 53m
Frontier
Deal found 2/5$283
This Kiwi.com deal was found by Cheapflights users on 2/3. 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.
mié. 3/48:17 pm
STL
-
IAD
1 stop13h 16m
Frontier
vie. 3/68:09 am
IAD
-
STL
1 stop16h 10m
Frontier
Deal found 2/3$283
This United Airlines deal was found by Cheapflights users on 2/4. 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.
mar. 3/36:25 am
STL
-
DCA
1 stop5h 42m
United Airlines
mié. 3/112:00 pm
DCA
-
STL
1 stop5h 00m
United Airlines
Deal found 2/4$284
This Delta deal was found by Cheapflights users on 2/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 3/35:50 pm
STL
-
IAD
1 stop4h 19m
Delta
mié. 3/1812:47 pm
IAD
-
STL
1 stop6h 06m
Delta
Deal found 2/4$284
This Kiwi.com deal was found by Cheapflights users on 2/4. 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.
lun. 3/21:54 pm
STL
-
DCA
1 stop22h 21m
Frontier
jue. 3/126:00 pm
DCA
-
STL
1 stop16h 49m
Frontier
Deal found 2/4$285
This Kiwi.com deal was found by Cheapflights users on 2/3. 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.
mié. 2/118:17 pm
STL
-
IAD
1 stop13h 32m
Frontier
dom. 2/155:39 pm
IAD
-
STL
1 stop14h 12m
Frontier
Deal found 2/3$285
This Kiwi.com deal was found by Cheapflights users on 2/4. 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.
lun. 3/98:12 pm
STL
-
DCA
1 stop15h 50m
Frontier
jue. 3/122:00 pm
DCA
-
STL
1 stop20h 49m
Frontier
Deal found 2/4$286
This Kiwi.com deal was found by Cheapflights users on 2/3. 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.
vie. 3/1312:16 pm
STL
-
IAD
1 stop11h 15m
Frontier
dom. 3/152:39 pm
IAD
-
STL
2 stops23h 55m
Frontier
Deal found 2/3$286

Find flight deals from St. Louis to District of Columbia

Keep the following information in mind while searching for St. Louis to District of Columbia flight deals. Data was last updated febrero 6, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$280
(Kiwi.com)

One-way from

$62
(Trip.com)

Popular in

January

Cheapest in

August

Average price

$304

Good round-trip deal

$303 or less

Good one-way deal

$158 or less
Provider with most accurate pricing for Lambert-St Louis-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Washington, D.C. (WAS) flights.
Search Deals
From Lambert-St Louis to District of Columbia
Search Deals
One-way flight from Lambert-St Louis to District of Columbia
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($39 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to District of Columbia.
Search Deals
Price to beat on a one-way flight from Lambert-St Louis to District of Columbia.
Search Deals

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated febrero 6, 2026.
Use the filters below to find and compare flights from St. Louis to District of Columbia that are best for you.

Fly from

St. Louis

Fly to

District of Columbia

Route

Depart

Return

Price

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

mié. 3/4

9:55 am-3:32 pm

1 stop4h 37m

Washington, D.C. Reagan-National

lun. 3/9

5:01 pm-9:07 pm

1 stop5h 06m

$284

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

mar. 5/12

1:10 pm-4:10 pm

Nonstop2h 00m

Washington, D.C. Reagan-National

sáb. 5/16

12:00 pm-6:05 pm

1 stop7h 05m

$284

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

mar. 3/3

6:25 am-11:59 am

1 stop4h 34m

Washington, D.C. Reagan-National

sáb. 3/14

7:30 am-12:27 pm

1 stop5h 57m

$284

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

mié. 3/4

7:41 am-2:13 pm

1 stop5h 32m

Washington, D.C. Reagan-National

sáb. 3/14

7:00 pm-10:59 pm

1 stop4h 59m

$284

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

mar. 4/21

3:40 pm-6:40 pm

Nonstop2h 00m

Washington, D.C. Reagan-National

vie. 4/24

6:45 pm-8:10 pm

Nonstop2h 25m

$287

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

jue. 3/5

10:11 pm-9:59 pm

2 stops46h 48m

Washington, D.C. Reagan-National

jue. 3/12

6:00 pm-9:49 am

1 stop16h 49m

$288

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

mar. 4/7

12:40 pm-8:45 pm

2 stops7h 05m

Washington, D.C. Reagan-National

jue. 4/9

6:45 pm-8:10 pm

Nonstop2h 25m

$289

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

mar. 3/3

6:30 am-12:54 pm

1 stop5h 24m

Washington, D.C. Reagan-National

vie. 3/13

6:00 am-11:09 am

1 stop6h 09m

$295

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

sáb. 5/23

8:55 am-11:55 am

Nonstop2h 00m

Washington, D.C. Reagan-National

mar. 5/26

6:50 pm-8:15 pm

Nonstop2h 25m

$295

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

mar. 5/19

1:05 pm-6:59 pm

1 stop4h 54m

Washington, D.C. Reagan-National

sáb. 5/23

6:00 am-9:39 am

1 stop4h 39m

$296

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/4

Showing 1-10 of 43 results
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Best time to book a flight from St. Louis to District of Columbia

Have a flexible travel schedule? Discover the best time to fly to District of Columbia from St. Louis 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 St. Louis to District of Columbia

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

Currently, December is the cheapest month in which you can book a flight from St. Louis to District of Columbia (average of $98). Flying from St. Louis to District of Columbia in June 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 STL to DC?

Find hourly flight availability from St. Louis to District of Columbia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated febrero 6, 2026.

When flying from St. Louis to District of Columbia, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 44% versus a flight at noon.

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

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

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

Weekly flight availability from St. Louis to District of Columbia

Explore weekly flight availability from St. Louis to District of Columbia. 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 febrero 6, 2026.

The most flights from STL to USDC are scheduled on a Monday (6 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (6 on average).

Reviews of airlines servicing District of Columbia

Get insights into the airlines that provide service to District of Columbia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to District of Columbia. Reviews last updated febrero 6, 2026.
Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from St. Louis to District of Columbia by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,275 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,275 reviews
Southwest
8.0
Very good
4,275 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Delta
7.9
Good
8,151 reviews
Southwest
8.0
Very good
4,275 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
United Airlines
7.4
Good
9,240 reviews
Southwest
8.0
Very good
4,275 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
American Airlines
7.2
Good
11,237 reviews
Southwest
8.0
Very good
4,275 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.7
Fair
3,052 reviews
Southwest
8.0
Very good
4,275 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

Find useful and relevant information for your journey from St. Louis to District of Columbia. 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 from for flights from St. Louis to District of Columbia?

    If you book a flight to District of Columbia from St. Louis, you will be flying from Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis.

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

    There are many flights that can get you from St. Louis to District of Columbia in 2h. Fly via United Airlines, Southwest, or Delta to get the fastest option. There are 717 mi between St. Louis and District of Columbia. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    The cheapest airlines for a one-way flight from St. Louis to District of Columbia are Frontier ($63), American Airlines ($69), and Delta ($89).

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

    Consider Avianca (74%), Copa Airlines (74%) or GoJet (69%) when booking your flight. These represent the most reliable airlines when flying from St. Louis to District of Columbia.

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

    Looking for the cheapest flight from St. Louis to District of Columbia? While on average our users pay $618, our data indicates the cheapest price to be $154. The most popular route (Lambert-St Louis - Washington, D.C. Dulles Intl), is priced around $184.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to District of Columbia 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 St. Louis to District of Columbia?

    Currently, December is the cheapest month in which you can book a flight from St. Louis to District of Columbia (average of $98). Flying from St. Louis to District of Columbia in June 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

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Alternative routes for St. Louis to District of Columbia

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

Discover the top 5 airlines that operate flights from St. Louis to District of Columbia. 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 febrero 6, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$73Average$218FlexibilityNo cancel feeOn-time62%
DeltaCheapest$99Average$288FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$175Average$341FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$189Average$347FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$263Average$454FlexibilityNo cancel feeOn-time69%

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