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 Southwest ($90), United Airlines ($90), and Delta ($99).

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 $2,249, our data indicates the cheapest price to be $143. The most popular route (Lambert-St Louis - Washington, D.C. Dulles Intl), is priced around $187.

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

Consider Avianca (92%), Copa Airlines (92%) or GoJet (89%) when booking your flight. These represent the most reliable airlines when flying from St. Louis to District of Columbia.

What are the most popular airlines that fly from St. Louis to District of Columbia?

When booking a flight from St. Louis to District of Columbia, you may want to consider flying on American Airlines, Delta or United Airlines as they are the most popular for this route.

How far in advance should I book a flight from St. Louis to District of Columbia?

To save up to 211% on this flight, we recommend booking at least 52 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from St. Louis to District of Columbia from $424 1-2 weeks out and tickets from $567 for flights departing within the next 72 hours.

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

November is one of the best times of the year to fly to District of Columbia from St. Louis. Prices for November average $296 per person but you can even find prices for as low as $137. The most expensive prices can be found in the month of March. Opting for a November flight can save you 25% on your journey compared to booking in March

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.

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.

$90+ Flights from St. Louis to District of Columbia

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1. Tell us where you want to go

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Cheap flight deals from St. Louis to District of Columbia

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$207 (Southwest)
One-way from	$90 (Southwest)
Popular in	March
Cheapest in	November
Average price	$371
Good round-trip deal	$253 or less
Good one-way deal	$123 or less

Provider with most accurate pricing for Lambert-St Louis-Washington, D.C. (WAS) flight deals.

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Provider most trusted by Cheapflights users for Lambert-St Louis-Washington, D.C. (WAS) flights.

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From Lambert-St Louis to District of Columbia

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One-way flight from Lambert-St Louis to District of Columbia

Search Deals

Highest demand for flights based on searches. 8% potential increase in price ($25 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in March 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 March 25, 2025.

Wed 7/29:56 amSTL - DCA

Nonstop2h 03mAmerican Airlines

Wed 7/93:13 pmDCA - STL

Nonstop2h 21mAmerican Airlines

Deal found 3/23

$204

Sat 4/123:45 pmSTL - DCA

1 stop3h 45mSouthwest

Mon 4/146:55 pmDCA - STL

Nonstop2h 15mSouthwest

Deal found 3/22

$207

Sat 4/261:12 pmSTL - IAD

1 stop5h 05mUnited Airlines

Tue 4/298:35 amIAD - STL

Nonstop2h 23mUnited Airlines

Deal found 3/24

$207

Mon 4/145:37 pmSTL - IAD

1 stop4h 30mDelta

Fri 4/1812:29 pmIAD - STL

1 stop4h 57mDelta

Deal found 3/25

$217

Fri 5/212:55 pmSTL - DCA

1 stop4h 47mDelta

Sun 5/116:00 amDCA - STL

1 stop4h 00mDelta

Deal found 3/24

$243

Sat 4/54:57 pmSTL - IAD

1 stop16h 58mFrontier

Tue 4/85:54 pmIAD - STL

1 stop6h 52mFrontier

Deal found 3/24

$248

Sat 4/126:45 pmSTL - IAD

1 stop15h 05mMultiple Airlines

Wed 4/165:52 pmIAD - STL

1 stop6h 54mMultiple Airlines

Deal found 3/24

$257

Mon 4/76:51 pmSTL - DCA

1 stop16h 13mFrontier

Tue 4/86:00 pmDCA - STL

1 stop16h 06mFrontier

Deal found 3/23

$259

Tue 4/85:35 pmSTL - DCA

1 stop4h 00mUnited Airlines

Sat 5/245:00 pmDCA - STL

1 stop6h 45mUnited Airlines

Deal found 3/23

$294

Thu 7/34:38 pmSTL - IAD

1 stop6h 21mAmerican Airlines

Sat 7/1211:07 amIAD - STL

1 stop7h 04mAmerican Airlines

Deal found 3/24

$297

Best flights from St. Louis to District of Columbia
Discover carefully curated flight deals from St. Louis to District of Columbia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 25, 2025.

Mon 4/145:20 pmSTL - DCA

1 stop4h 35mSouthwest

Fri 4/188:00 amDCA - STL

Nonstop2h 10mSouthwest

Deal found 3/24

$207

Sat 4/261:12 pmSTL - IAD

1 stop5h 05mUnited Airlines

Tue 4/298:35 amIAD - STL

Nonstop2h 23mUnited Airlines

Deal found 3/24

$207

Mon 4/141:46 pmSTL - DCA

1 stop4h 13mDelta

Fri 4/186:00 amDCA - STL

1 stop4h 28mDelta

Deal found 3/25

$217

Wed 4/237:35 amSTL - DCA

1 stop7h 44mAmerican Airlines

Thu 4/248:22 amDCA - STL

Nonstop2h 30mAmerican Airlines

Deal found 3/24

$220

Sat 4/56:51 pmSTL - DCA

1 stop16h 13mFrontier

Tue 4/81:03 pmDCA - STL

1 stop21h 03mFrontier

Deal found 3/24

$248

Sat 4/126:45 pmSTL - IAD

1 stop15h 05mMultiple Airlines

Wed 4/165:52 pmIAD - STL

1 stop6h 54mMultiple Airlines

Deal found 3/24

$257

Mon 4/145:37 pmSTL - IAD

1 stop4h 30mDelta

Thu 4/179:20 amIAD - STL

1 stop4h 41mDelta

Deal found 3/23

$217

Sat 4/54:57 pmSTL - IAD

1 stop16h 58mFrontier

Tue 4/85:54 pmIAD - STL

1 stop6h 52mFrontier

Deal found 3/24

$248

Thu 7/34:38 pmSTL - IAD

1 stop6h 21mAmerican Airlines

Sat 7/1211:07 amIAD - STL

1 stop7h 04mAmerican Airlines

Deal found 3/24

$297

Sun 7/206:33 amSTL - DCA

1 stop4h 26mUnited Airlines

Sun 7/275:00 pmDCA - STL

1 stop6h 45mUnited Airlines

Deal found 3/24

$307

Last-minute flights from St. Louis to District of Columbia
Discover last-minute flight deals from St. Louis to District of Columbia. Data last updated March 25, 2025 and is based on user searches.

Thu 3/2711:55 amSTL - DCA

2 stops17h 50mAlaska Airlines

Sun 3/3010:10 pmDCA - STL

2 stops25h 08mAlaska Airlines

Deal found 3/22

$13,812

Mon 3/313:40 pmSTL - DCA

1 stop4h 25mUnited Airlines

Wed 4/210:30 amDCA - STL

1 stop5h 12mUnited Airlines

Deal found 3/24

$549

Mon 3/315:55 amSTL - IAD

2 stops10h 02mAmerican Airlines

Wed 4/21:52 pmIAD - STL

1 stop6h 20mAmerican Airlines

Deal found 3/24

$869

Tue 4/14:57 pmSTL - IAD

1 stop23h 07mFrontier

Tue 4/85:54 pmIAD - STL

1 stop6h 52mFrontier

Deal found 3/23

$261

Tue 4/16:10 amSTL - DCA

Nonstop2h 06mAmerican Airlines

Wed 4/29:05 pmDCA - STL

Nonstop2h 24mAmerican Airlines

Deal found 3/24

$529

Thu 4/31:20 pmSTL - DCA

Nonstop1h 55mSouthwest

Mon 4/712:00 pmDCA - STL

Nonstop2h 20mSouthwest

Deal found 3/22

$449

Thu 4/31:05 pmSTL - DCA

1 stop6h 51mDelta

Mon 4/77:30 pmDCA - STL

1 stop4h 59mDelta

Deal found 3/23

$469

Fri 4/48:25 amSTL - IAD

Nonstop2h 09mUnited Airlines

Wed 4/98:35 amIAD - STL

Nonstop2h 23mUnited Airlines

Deal found 3/24

$449

Sat 4/54:57 pmSTL - IAD

1 stop16h 58mFrontier

Tue 4/85:54 pmIAD - STL

1 stop6h 52mFrontier

Deal found 3/24

$248

Mon 4/76:51 pmSTL - DCA

1 stop16h 13mFrontier

Tue 4/86:00 pmDCA - STL

1 stop16h 06mFrontier

Deal found 3/23

$259

Tue 4/85:35 pmSTL - DCA

1 stop4h 00mUnited Airlines

Sat 5/245:00 pmDCA - STL

1 stop6h 45mUnited Airlines

Deal found 3/23

$294

Sat 4/123:45 pmSTL - DCA

1 stop3h 45mSouthwest

Mon 4/146:55 pmDCA - STL

Nonstop2h 15mSouthwest

Deal found 3/22

$207

One-way flights from St. Louis to District of Columbia
Search for one-way flight options from St. Louis to District of Columbia. Find affordable one-way fares based on user searches. Data last updated March 25, 2025.

Tue 7/13:55 pmSTL - DCA

Nonstop2h 00mSouthwest

Deal found 3/24

$90

Tue 7/18:15 amSTL - IAD

Nonstop2h 08mUnited Airlines

Deal found 3/24

$90

Wed 4/2312:55 pmSTL - DCA

1 stop4h 47mDelta

Deal found 3/24

$99

Thu 5/295:40 pmSTL - IAD

1 stop5h 48mDelta

Deal found 3/25

$99

Wed 6/259:56 amSTL - DCA

Nonstop2h 03mAmerican Airlines

Deal found 3/24

$115

Sat 4/126:45 pmSTL - IAD

1 stop15h 05mSun Country Air

Deal found 3/24

$123

Wed 4/96:51 pmSTL - DCA

1 stop21h 08mFrontier

Deal found 3/24

$127

Wed 4/94:57 pmSTL - IAD

1 stop23h 05mFrontier

Deal found 3/24

$127

Thu 6/59:04 amSTL - IAD

1 stop7h 07mAmerican Airlines

Deal found 3/24

$134

Mon 7/78:00 amSTL - DCA

1 stop5h 13mUnited Airlines

Deal found 3/24

$146

Thu 5/810:10 amSTL - IAD

3 stops24h 10mMultiple Airlines

Deal found 3/24

$172

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to District of Columbia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 4/12

3:45 pm-8:30 pm

1 stop3h 45m

Washington, D.C. Reagan-National

Mon 4/14

6:55 pm-8:10 pm

Nonstop2h 15m

$207

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sat 4/26

1:12 pm-7:17 pm

1 stop5h 05m

Washington, D.C. Dulles Intl

Tue 4/29

8:35 am-9:58 am

Nonstop2h 23m

$207

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Mon 4/14

5:37 pm-11:07 pm

1 stop4h 30m

Washington, D.C. Dulles Intl

Fri 4/18

12:29 pm-4:26 pm

1 stop4h 57m

$217

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 4/23

7:35 am-4:19 pm

1 stop7h 44m

Washington, D.C. Reagan-National

Thu 4/24

8:22 am-9:52 am

Nonstop2h 30m

$220

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Fri 5/2

12:55 pm-6:42 pm

1 stop4h 47m

Washington, D.C. Reagan-National

Sun 5/11

6:00 am-9:00 am

1 stop4h 00m

$243

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sat 4/5

4:57 pm-10:55 am

1 stop16h 58m

Washington, D.C. Dulles Intl

Tue 4/8

5:54 pm-11:46 pm

1 stop6h 52m

$248

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sat 4/12

6:45 pm-10:50 am

1 stop15h 05m

Washington, D.C. Dulles Intl

Wed 4/16

5:52 pm-11:46 pm

1 stop6h 54m

$257

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Mon 4/7

6:51 pm-12:04 pm

1 stop16h 13m

Washington, D.C. Reagan-National

Tue 4/8

6:00 pm-9:06 am

1 stop16h 06m

$259

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 4/8

5:35 pm-10:35 pm

1 stop4h 00m

Washington, D.C. Reagan-National

Sat 5/24

5:00 pm-10:45 pm

1 stop6h 45m

$294

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Thu 7/3

4:38 pm-11:59 pm

1 stop6h 21m

Washington, D.C. Dulles Intl

Sat 7/12

11:07 am-5:11 pm

1 stop7h 04m

$297

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 21 results

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 $309). Flying from St. Louis to District of Columbia in June is currently the most expensive (average of $387). 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?

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.

Weekly flight availability from St. Louis to District of Columbia

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).

Rainfall in District of Columbia by month

In terms of precipitation, rainfall in District of Columbia ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit District of Columbia when rainfall is around 2.6 in.

Temperature in District of Columbia by month

If weather is an important factor for your trip to District of Columbia, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

Reviews of airlines servicing District of Columbia

Read reviews from past customers who have flown Southwest, Delta and United Airlines from St. Louis to District of Columbia. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,272 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Southwest

8.0

Very good

4,272 reviews

Southwest

8.0

Very good

4,272 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Delta

8.0

Very good

7,890 reviews

Southwest

8.0

Very good

4,272 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

United Airlines

7.4

Good

8,605 reviews

Southwest

8.0

Very good

4,272 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

American Airlines

7.2

Good

10,000 reviews

Southwest

8.0

Very good

4,272 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Sun Country Air

6.9

Okay

348 reviews

Southwest

8.0

Very good

4,272 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Related info for your journey

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.
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 Southwest ($90), United Airlines ($90), and Delta ($99).
What are the most reliable airlines from St. Louis to District of Columbia?
Consider Avianca (92%), Copa Airlines (92%) or GoJet (89%) 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 $2,249, our data indicates the cheapest price to be $143. The most popular route (Lambert-St Louis - Washington, D.C. Dulles Intl), is priced around $187.
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 $309). Flying from St. Louis to District of Columbia in June is currently the most expensive (average of $387). 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

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Top 5 airlines flying from St. Louis to District of Columbia

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$98	Average$163	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$129	Average$323	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$186	Average$310	FlexibilityNo cancel fee	On-timeN/A
Southwest	Cheapest$197	Average$343	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$211	Average$379	FlexibilityNo cancel fee	On-time69%

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$90+ 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 5/24. Fares are subject to change and may not be available on all flights or dates of travel.

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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 March 25, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from St. Louis to District of Columbia

Cheapest flights from St. Louis to District of ColumbiaExplore 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 March 25, 2025.

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 March 25, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to District of Columbia that are best for you.

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.

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?

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 March 25, 2025.

Weekly flight availability from St. Louis to District of Columbia

Rainfall in District of Columbia by month

Plan your trip to District of Columbia by taking into account the average rainfall totals by month.

Temperature in District of Columbia by month

Plan your trip to District of Columbia by taking into account the average temperature totals by month.

Reviews of airlines servicing District of Columbia

Read reviews from past customers who have flown Southwest, Delta and United Airlines from St. Louis to District of Columbia. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

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

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

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

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

How can I 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?

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

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.

Top 5 airlines flying from St. Louis to District of Columbia

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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 March 25, 2025.