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$99+ 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 8/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BWI
ago. 5 — ago. 121
mar. 8/5
mar. 8/12
1 adult, Economy
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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 julio 31, 2025.

Round-trip from

$208
(Frontier)

One-way from

$99
(Frontier)

Popular in

March

Cheapest in

August

Average price

$309

Good round-trip deal

$212 or less

Good one-way deal

$125 or less
From Lambert-St Louis to District of Columbia
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One-way flight from Lambert-St Louis to District of Columbia
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Highest demand for flights based on searches. 10% potential increase in price ($32 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Lambert-St Louis to District of Columbia.
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Price to beat on a one-way flight from Lambert-St Louis to District of Columbia.
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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 julio 31, 2025.

This Frontier deal was found by Cheapflights users on 7/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/22:52 pmSTL - IAD
1 stop7h 27mFrontier
sáb. 8/96:10 amIAD - STL
1 stop8h 49mFrontier
Deal found 7/30$198
This Southwest deal was found by Cheapflights users on 7/31. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/287:25 pmSTL - DCA
Nonstop2h 05mSouthwest
jue. 9/46:50 pmDCA - STL
Nonstop2h 10mSouthwest
Deal found 7/31$217
This FlightHub deal was found by Cheapflights users on 7/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/277:54 pmSTL - DCA
1 stop15h 17mFrontier
mié. 9/31:00 pmDCA - STL
1 stop21h 06mFrontier
Deal found 7/30$225
This United Airlines deal was found by Cheapflights users on 7/31. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/276:35 amSTL - IAD
1 stop4h 20mUnited Airlines
sáb. 9/68:40 amIAD - STL
Nonstop2h 22mUnited Airlines
Deal found 7/31$227
This United Airlines deal was found by Cheapflights users on 7/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/127:00 amSTL - DCA
1 stop4h 34mUnited Airlines
mié. 11/125:00 pmDCA - STL
1 stop6h 45mUnited Airlines
Deal found 7/30$232
This American Airlines deal was found by Cheapflights users on 7/30. 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.
sáb. 8/236:02 amSTL - DCA
Nonstop2h 01mAmerican Airlines
lun. 8/252:56 pmDCA - STL
Nonstop2h 18mAmerican Airlines
Deal found 7/30$233
This Delta deal was found by Cheapflights users on 7/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/266:40 amSTL - DCA
1 stop3h 54mDelta
mar. 8/266:20 pmDCA - STL
1 stop4h 42mDelta
Deal found 7/30$237
This Delta deal was found by Cheapflights users on 7/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/1711:04 amSTL - IAD
1 stop4h 23mDelta
sáb. 10/46:16 pmIAD - STL
1 stop4h 34mDelta
Deal found 7/30$237
This American Airlines deal was found by Cheapflights users on 7/31. 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.
sáb. 9/206:10 amSTL - IAD
2 stops11h 37mAmerican Airlines
dom. 9/218:12 pmIAD - STL
1 stop4h 41mAmerican Airlines
Deal found 7/31$299
This Mytrip deal was found by Cheapflights users on 7/30. 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.
jue. 8/1410:37 amSTL - IAD
3 stops26h 46mMultiple Airlines
dom. 8/1711:04 amIAD - STL
2 stops8h 37mMultiple Airlines
Deal found 7/30$319

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 julio 31, 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

sáb. 8/30

3:02 pm-11:00 pm

1 stop6h 58m

Washington, D.C. Dulles Intl

lun. 9/1

6:10 am-12:56 pm

1 stop7h 46m

$208

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

jue. 8/28

7:25 pm-10:30 pm

Nonstop2h 05m

Washington, D.C. Reagan-National

jue. 9/4

6:50 pm-8:00 pm

Nonstop2h 10m

$217

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

mié. 8/27

7:54 pm-12:11 pm

1 stop15h 17m

Washington, D.C. Reagan-National

mié. 9/3

1:00 pm-9:06 am

1 stop21h 06m

$225

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

mié. 8/27

6:35 am-11:55 am

1 stop4h 20m

Washington, D.C. Dulles Intl

sáb. 9/6

8:40 am-10:02 am

Nonstop2h 22m

$227

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

mié. 11/12

7:00 am-12:34 pm

1 stop4h 34m

Washington, D.C. Reagan-National

mié. 11/12

5:00 pm-10:45 pm

1 stop6h 45m

$232

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

sáb. 8/23

6:02 am-9:03 am

Nonstop2h 01m

Washington, D.C. Reagan-National

lun. 8/25

2:56 pm-4:14 pm

Nonstop2h 18m

$233

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

mar. 8/26

6:40 am-11:34 am

1 stop3h 54m

Washington, D.C. Reagan-National

mar. 8/26

6:20 pm-10:02 pm

1 stop4h 42m

$237

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

mié. 9/17

11:04 am-4:27 pm

1 stop4h 23m

Washington, D.C. Dulles Intl

sáb. 10/4

6:16 pm-9:50 pm

1 stop4h 34m

$237

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

sáb. 9/20

6:10 am-6:47 pm

2 stops11h 37m

Washington, D.C. Dulles Intl

dom. 9/21

8:12 pm-11:53 pm

1 stop4h 41m

$299

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

jue. 8/14

10:37 am-2:23 pm

3 stops26h 46m

Washington, D.C. Dulles Intl

dom. 8/17

11:04 am-6:41 pm

2 stops8h 37m

$319

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 20 results
1
2

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, August is the cheapest month in which you can book a flight from St. Louis to District of Columbia (average of $241). Flying from St. Louis to District of Columbia in March is currently the most expensive (average of $290). 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 julio 31, 2025.

When flying from St. Louis to District of Columbia, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 julio 31, 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
4,246 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Delta
8.0
Very good
7,981 reviews
Southwest
8.0
Very good
4,246 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
United Airlines
7.4
Good
8,900 reviews
Southwest
8.0
Very good
4,246 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,246 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Frontier
5.9
Fair
3,239 reviews
Southwest
8.0
Very good
4,246 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

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 popular is this St. Louis to District of Columbia flight route?

    Flights from Lambert-St Louis to District of Columbia have been viewed 26 times in the past calendar month.

  • 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 ($99), Southwest ($109), and Delta ($119).

  • 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 $329, our data indicates the cheapest price to be $108. The most popular route (Lambert-St Louis - Washington, D.C. Dulles Intl), is priced around $218.

  • 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, August is the cheapest month in which you can book a flight from St. Louis to District of Columbia (average of $241). Flying from St. Louis to District of Columbia in March is currently the most expensive (average of $290). 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 julio 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$124Average$221FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$129Average$357FlexibilityNo cancel feeOn-time71%
DeltaCheapest$168Average$276FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$190Average$333FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$209Average$378FlexibilityNo cancel feeOn-time69%

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