HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
District of Columbia

$55+ 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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
STL — IAD
Dec 4 — Dec 111
Thu 12/4
Thu 12/11
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to District of Columbia with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap 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 November 4, 2025.

Most accurate provider

Gotogate
3 stars

Most trusted provider

Gotogate
3 stars

Round-trip from

$192
(Kiwi.com)

One-way from

$55
(Mytrip)

Popular in

March

Cheapest in

August

Average price

$247

Good round-trip deal

$313 or less

Good one-way deal

$168 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. 10% potential increase in price ($34 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 November 2025
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

Find 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 November 4, 2025.

This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/1510:47 amSTL - IAD
1 stop5h 38mFrontier
Thu 1/15:35 amIAD - STL
1 stop5h 05mFrontier
Deal found 11/3$190
This Booking.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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/127:45 pmSTL - DCA
1 stop16h 17mFrontier
Sat 11/158:15 amDCA - STL
1 stop25h 52mFrontier
Deal found 11/3$192
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.
Thu 12/1112:04 pmSTL - IAD
1 stop5h 14mFrontier
Mon 12/155:45 amIAD - STL
2 stops17h 48mFrontier
Deal found 11/3$192
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.
Wed 12/37:43 pmSTL - DCA
1 stop16h 23mFrontier
Sat 12/66:00 pmDCA - STL
2 stops15h 59mFrontier
Deal found 11/3$200
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.
Wed 11/197:24 pmSTL - IAD
1 stop13h 53mFrontier
Mon 12/85:45 amIAD - STL
2 stops17h 48mFrontier
Deal found 11/3$202
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/1410:42 amSTL - IAD
1 stop4h 42mFrontier
Thu 1/15:35 amIAD - STL
1 stop5h 05mFrontier
Deal found 11/3$204
This Frontier deal was found by Cheapflights users on 11/4. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/144:56 pmSTL - IAD
1 stop6h 15mFrontier
Sun 11/235:42 amIAD - STL
1 stop9h 47mFrontier
Deal found 11/4$208
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.
Wed 12/107:43 pmSTL - DCA
1 stop16h 23mFrontier
Sat 12/136:00 pmDCA - STL
2 stops19h 12mFrontier
Deal found 11/2$210
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.
Thu 11/207:57 pmSTL - DCA
1 stop16h 06mFrontier
Mon 11/242:00 pmDCA - STL
1 stop29h 58mFrontier
Deal found 11/1$212
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.
Fri 12/1210:42 amSTL - IAD
1 stop4h 42mFrontier
Sat 1/1710:23 pmIAD - STL
2 stops12h 23mFrontier
Deal found 11/3$216
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/37:00 pmSTL - DCA
Nonstop1h 55mSouthwest
Wed 12/108:15 amDCA - STL
Nonstop2h 20mSouthwest
Deal found 11/3$217
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/67:45 pmSTL - DCA
1 stop16h 17mFrontier
Mon 11/108:15 amDCA - STL
1 stop25h 52mFrontier
Deal found 11/3$221

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 November 4, 2025.
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 - IAD

STLIAD

Lambert-St Louis

Tue 12/2

9:30 am-5:00 pm

1 stop6h 30m

Washington, D.C. Dulles Intl

Tue 12/9

10:08 am-4:06 pm

1 stop6h 58m

$260

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 12/10

7:00 pm-9:55 pm

Nonstop1h 55m

Washington, D.C. Reagan-National

Sat 12/13

8:00 am-9:20 am

Nonstop2h 20m

$263

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 1/1

8:50 am-11:45 am

Nonstop1h 55m

Washington, D.C. Reagan-National

Sat 1/17

12:35 pm-2:05 pm

Nonstop2h 30m

$263

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 12/9

3:20 pm-6:15 pm

Nonstop1h 55m

Washington, D.C. Reagan-National

Wed 12/10

6:10 pm-7:35 pm

Nonstop2h 25m

$263

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 12/9

5:15 am-12:46 pm

1 stop6h 31m

Washington, D.C. Reagan-National

Wed 12/10

7:50 am-9:23 am

Nonstop2h 33m

$273

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 12/2

10:35 am-6:20 pm

2 stops6h 45m

Washington, D.C. Reagan-National

Tue 12/9

12:25 pm-1:45 pm

Nonstop2h 20m

$278

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Mon 12/8

7:00 pm-9:55 pm

Nonstop1h 55m

Washington, D.C. Reagan-National

Thu 1/1

2:45 pm-4:05 pm

Nonstop2h 20m

$281

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Tue 12/9

10:45 am-4:23 pm

1 stop4h 38m

Washington, D.C. Dulles Intl

Wed 12/10

12:30 pm-6:33 pm

1 stop7h 03m

$283

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 12/13

7:55 am-3:40 pm

2 stops6h 45m

Washington, D.C. Reagan-National

Sat 12/13

4:45 pm-8:50 pm

1 stop5h 05m

$288

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Tue 1/20

8:05 am-4:00 pm

1 stop6h 55m

Washington, D.C. Dulles Intl

Thu 1/22

5:38 pm-11:59 pm

1 stop7h 21m

$301

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/2

Showing 1-10 of 40 results
1
2
3
4

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 $198). 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 November 4, 2025.

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 48% 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 November 2, 2025.

Travelers seeking maximum savings on their St. Louis to District of Columbia flight should consider departing on Tuesday evenings when fares are most often at their lowest. Saturday 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 November 4, 2025.

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 November 4, 2025.
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
4,238 reviews

Boarding

8.1

Overall

8.0

Comfort

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,238 reviews
Southwest
8.0
Very good
4,238 reviews

Boarding

8.1

Overall

8.0

Comfort

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
7.9
Good
8,002 reviews
Southwest
8.0
Very good
4,238 reviews

Boarding

8.1

Overall

8.0

Comfort

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,997 reviews
Southwest
8.0
Very good
4,238 reviews

Boarding

8.1

Overall

8.0

Comfort

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
11,038 reviews
Southwest
8.0
Very good
4,238 reviews

Boarding

8.1

Overall

8.0

Comfort

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,117 reviews
Southwest
8.0
Very good
4,238 reviews

Boarding

8.1

Overall

8.0

Comfort

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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 1h 55m. Fly via Delta, Southwest, or American Airlines 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 United Airlines ($132), Southwest ($137), and Delta ($142).

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

    Consider Copa Airlines (83%), Avianca (81%) or GoJet (80%) 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 $499, our data indicates the cheapest price to be $145. The most popular route (Lambert-St Louis - Washington, D.C. Dulles Intl), is priced around $203.

  • 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 $198). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to District of Columbia

See prices for flight routes from nearby airports that may be better suited for you.
St. Louis to John F Kennedy Intl flights
St. Louis to LaGuardia flights
St. Louis to Las Vegas flights
St. Louis to Newark flights
Kansas City to John F Kennedy Intl flights
Kansas City to Denver flights
Kansas City to LaGuardia flights
Kansas City to Newark flights
Kansas City to Las Vegas flights
St. Louis to Hobby flights
St. Louis to Sky Harbor Intl flights
Kansas City to Los Angeles flights
St. Louis to Orlando flights
St. Louis to Miami flights
St. Louis to Denver flights
Kansas City to Hobby flights
St. Louis to Dallas/Fort Worth flights
Kansas City to Orlando flights
St. Louis to George Bush Intcntl flights
St. Louis to Los Angeles flights
Kansas City to Atlanta flights
Kansas City to Sky Harbor Intl flights
Kansas City to O'Hare Intl flights
Kansas City to Dallas/Fort Worth flights
Kansas City to George Bush Intcntl flights
Kansas City to Miami flights
Kansas City to Tampa flights
St. Louis to Atlanta flights
Kansas City to Dulles Intl flights
Kansas City to Seattle flights
St. Louis to O'Hare Intl flights
St. Louis to Tampa flights
St. Louis to Dulles Intl flights
St. Louis to San Diego flights
St. Louis to Seattle flights
Kansas City to Boston flights
St. Louis to San Francisco flights
St. Louis to Philadelphia flights
St. Louis to Salt Lake City flights
St. Louis to Honolulu flights
St. Louis to Reagan-National flights
St. Louis to Boston flights
St. Louis to Minneapolis flights
St. Louis to Baltimore flights
St. Louis to New Orleans flights
Kansas City to Honolulu flights
St. Louis to Love Field flights
St. Louis to Fort Lauderdale flights
Springfield to Orlando flights
St. Louis to Detroit flights

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 November 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$111Average$217FlexibilityNo cancel feeOn-time62%
DeltaCheapest$124Average$281FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$172Average$337FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$198Average$342FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$238Average$426FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.