How long is the flight from St. Louis to Washington, D.C.?

There are many flights that can get you from St. Louis to Washington, D.C. in 2h 12m. Fly via Frontier, Delta, or American Airlines to get the fastest option. There are 717 mi between St. Louis and Washington, D.C.. Both multi-stop and nonstop flights can be found to your destination and back.

What are the cheapest airlines flying from St. Louis to Washington, D.C. round-trip?

Flying on American Airlines is currently your cheapest option to Washington, D.C., with prices starting at $129. Additional round-trip tickets that might be worth considering are offered by Delta and Southwest, with the lowest prices starting at $168 and $195, respectively. American Airlines is 57% cheaper than the average price of flights available within the next 90 days to this destination.

What are the cheapest airlines to fly from St. Louis to Washington, D.C. one-way?

For one-way options, check prices for American Airlines. According to our data, you can fly for as low as $66. Users have also found prices from $72 and $76 on Frontier and United Airlines, respectively.

In terms of precipitation, rainfall in Washington, D.C. 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 Washington, D.C. when rainfall is around 2.6 in.

If weather is an important factor for your trip to Washington, D.C., 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).

What are the most popular routes from St. Louis to Washington, D.C.?

The most popular route from St. Louis to Washington, D.C. is Lambert-St Louis - Washington, D.C. Dulles Intl. You may also consider Lambert-St Louis - Washington, D.C. Reagan-National or Lambert-St Louis - Baltimore/Washington.

What are the cheapest flights from St. Louis to Washington, D.C.?

While on average a flight from St. Louis to Washington, D.C. is generally $638, our data shows the cheapest flight currently is $153. When looking at the most popular route, (Lambert-St Louis - Washington, D.C. Dulles Intl), you can expect to pay $197 for that flight.

What are the most reliable airlines from St. Louis to Washington, D.C.?

The top 3 most reliable airlines when flying from St. Louis to Washington, D.C. are Avianca (84%), Copa Airlines (84%) and Lufthansa (79%).

What are the most popular airlines that fly from St. Louis to Washington, D.C.?

American Airlines, Delta and United Airlines are the most popular airlines when flying from St. Louis to Washington, D.C..

What is the cheapest day to fly round-trip from St. Louis to Washington, D.C.?

Flights from St. Louis to Washington, D.C. are found to be more expensive on Saturday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Washington, D.C..

How far in advance should I book a flight from St. Louis to Washington, D.C.?

Travelers have found it’s best to book a flight 52 days in advance to save up to 233% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 52 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from St. Louis to Washington, D.C. 1-2 weeks in advance for as low as $435, or $584 for flights within the next 24 hours.

What is the cheapest month to fly from St. Louis to Washington, D.C.?

Due to multiple factors, expect to potentially pay more when booking in March. For low rates, August can be a great choice for travel to Washington, D.C.. Flights to Washington, D.C. from St. Louis in August are about $301 on average during August, but can be found for as low as $112.

What airport do you fly from for flights from St. Louis to Washington, D.C.?

If you book a flight to Washington, D.C. 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. There are 13 flights from Lambert-St Louis to Washington, D.C. per day from 5 different airlines.

Can I find deals for flights from St. Louis to Washington, D.C. that include hotel bookings?

Yes. In addition to deals on St. Louis to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from St. Louis to Washington, D.C.?

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

Can I find deals for business class flights from St. Louis to Washington, D.C.?

Yes. Cheapflights offers flight deals from St. Louis to Washington, D.C. by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$65+ Cheap Flights from St. Louis to Washington, D.C.

Q: How much does it cost to fly round-trip from St. Louis to Washington, D.C.?

Airfare is below average for this route at the moment. St. Louis to Washington, D.C. flights typically cost between $247 and $466 in October. The cheapest round-trip price found within the last 3 days was $143 on Frontier (Oct 2-Oct 6).

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

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Cheapflights Tip: The best prices from Lambert-St Louis to Washington, D.C. are usually found in August or November, booked 51 days in advance, depart on a Friday or Tuesday and return on a Wednesday

Cheap flight deals from St. Louis to Washington, D.C.

Round-trip from	$143 (Priceline)
One-way from	$65 (American Airlines)
Popular in	March
Cheapest in	August
Average price	$341
Good round-trip deal	$265 or less
Good one-way deal	$161 or less

From Lambert-St Louis to Washington, D.C. (WAS)

Search Deals

One-way flight from Lambert-St Louis to Washington, D.C. (WAS)

Search Deals

Highest demand for flights based on searches. 7% potential increase in price ($26 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 September 2025

Search Deals

Price to beat on a round-trip flight from Lambert-St Louis to Washington, D.C. (WAS).

Search Deals

Price to beat on a one-way flight from Lambert-St Louis to Washington, D.C. (WAS).

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Find flight deals from St. Louis to Washington, D.C.

Cheapest flights from St. Louis to Washington, D.C.
Explore the most affordable flight options available from St. Louis to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

Thu 10/210:49 amSTL - BWI

1 stop6h 04mFrontier

Mon 10/66:22 amBWI - STL

1 stop9h 42mFrontier

Deal found 9/14

$143

Thu 9/2510:49 amSTL - BWI

1 stop6h 04mFrontier

Mon 9/296:22 amBWI - STL

1 stop9h 42mFrontier

Deal found 9/14

$144

Thu 10/231:41 pmSTL - BWI

1 stop17h 53mFrontier

Mon 10/276:29 pmBWI - STL

1 stop15h 38mFrontier

Deal found 9/14

$145

Tue 10/1412:51 pmSTL - BWI

1 stop6h 57mAmerican Airlines

Wed 10/156:13 pmBWI - STL

1 stop6h 41mAmerican Airlines

Deal found 9/14

$158

Fri 10/246:42 pmSTL - BWI

1 stop21h 55mFrontier

Sun 10/269:42 pmBWI - STL

1 stop12h 50mFrontier

Deal found 9/13

$159

Fri 9/261:57 pmSTL - BWI

1 stop24h 32mFrontier

Sun 9/286:22 amBWI - STL

1 stop9h 42mFrontier

Deal found 9/14

$178

Fri 10/314:52 pmSTL - BWI

1 stop6h 26mFrontier

Sun 11/25:00 amBWI - STL

1 stop5h 12mFrontier

Deal found 9/15

$183

Thu 10/24:00 pmSTL - IAD

1 stop6h 39mFrontier

Sun 10/510:09 pmIAD - STL

2 stops17h 55mFrontier

Deal found 9/15

$186

Tue 11/117:45 pmSTL - DCA

1 stop15h 16mFrontier

Sat 11/156:00 pmDCA - STL

1 stop16h 07mFrontier

Deal found 9/14

$188

Tue 10/147:52 pmSTL - DCA

1 stop15h 12mFrontier

Sat 10/187:00 amDCA - STL

1 stop27h 07mFrontier

Deal found 9/15

$189

Thu 9/184:00 pmSTL - BWI

1 stop7h 17mFrontier

Sun 9/216:22 amBWI - STL

1 stop9h 42mFrontier

Deal found 9/14

$190

Fri 10/106:05 pmSTL - BWI

1 stop14h 16mFrontier

Mon 10/136:29 pmBWI - STL

1 stop15h 38mFrontier

Deal found 9/15

$191

Best flights from St. Louis to Washington, D.C.
Discover carefully curated flight deals from St. Louis to Washington, D.C. that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 16, 2025.

Fri 10/246:42 pmSTL - BWI

1 stop21h 55mFrontier

Sun 10/269:42 pmBWI - STL

1 stop12h 50mFrontier

Deal found 9/15

$145

Mon 10/274:10 pmSTL - DCA

1 stop5h 52mDelta

Tue 10/286:59 amDCA - STL

1 stop4h 27mDelta

Deal found 9/15

$197

Sat 11/88:43 amSTL - DCA

Nonstop2h 12mAmerican Airlines

Tue 11/117:50 amDCA - STL

Nonstop2h 30mAmerican Airlines

Deal found 9/14

$197

Thu 11/1312:20 pmSTL - BWI

1 stop5h 57mSpirit Airlines

Sun 11/165:10 amBWI - STL

1 stop6h 51mSpirit Airlines

Deal found 9/14

$205

Sat 10/254:51 pmSTL - BWI

1 stop10h 39mMultiple Airlines

Sun 10/2611:56 amBWI - STL

2 stops24h 47mMultiple Airlines

Deal found 9/15

$259

Thu 10/231:41 pmSTL - BWI

1 stop17h 53mFrontier

Mon 10/276:29 pmBWI - STL

1 stop15h 38mFrontier

Deal found 9/14

$145

Tue 10/146:14 pmSTL - DCA

1 stop3h 45mDelta

Wed 10/158:59 amDCA - STL

1 stop4h 36mDelta

Deal found 9/14

$197

Mon 10/2710:54 amSTL - DCA

Nonstop2h 05mAmerican Airlines

Tue 10/282:35 pmDCA - STL

1 stop4h 45mAmerican Airlines

Deal found 9/15

$204

Tue 10/147:52 pmSTL - DCA

1 stop15h 12mFrontier

Sat 10/187:00 amDCA - STL

1 stop27h 07mFrontier

Deal found 9/15

$189

Fri 10/315:15 pmSTL - DCA

1 stop5h 26mDelta

Sun 11/27:00 amDCA - STL

1 stop4h 31mDelta

Deal found 9/15

$197

Thu 11/66:00 amSTL - DCA

1 stop5h 45mDelta

Mon 11/106:18 pmDCA - STL

1 stop6h 22mDelta

Deal found 9/15

$197

Thu 11/65:00 amSTL - BWI

1 stop4h 58mAmerican Airlines

Mon 11/1011:09 amBWI - STL

1 stop6h 56mAmerican Airlines

Deal found 9/14

$221

Last-minute flights from St. Louis to Washington, D.C.
Discover last-minute flight deals from St. Louis to Washington, D.C.. Data last updated September 16, 2025 and is based on user searches.

Thu 9/184:00 pmSTL - BWI

1 stop7h 17mFrontier

Sun 9/216:22 amBWI - STL

1 stop9h 42mFrontier

Deal found 9/14

$190

Sat 9/207:55 pmSTL - BWI

1 stop20h 47mFrontier

Mon 9/226:22 amBWI - STL

1 stop9h 42mFrontier

Deal found 9/15

$192

Thu 9/2510:49 amSTL - BWI

1 stop6h 04mFrontier

Mon 9/296:22 amBWI - STL

1 stop9h 42mFrontier

Deal found 9/14

$144

Fri 9/261:57 pmSTL - BWI

1 stop24h 32mFrontier

Sun 9/286:22 amBWI - STL

1 stop9h 42mFrontier

Deal found 9/14

$178

Fri 9/267:55 pmSTL - DCA

1 stop25h 04mFrontier

Mon 9/291:00 pmDCA - STL

1 stop21h 06mFrontier

Deal found 9/15

$196

Thu 10/210:49 amSTL - BWI

1 stop6h 04mFrontier

Mon 10/66:22 amBWI - STL

1 stop9h 42mFrontier

Deal found 9/14

$143

Thu 10/24:00 pmSTL - IAD

1 stop6h 39mFrontier

Sun 10/510:09 pmIAD - STL

2 stops17h 55mFrontier

Deal found 9/15

$186

Fri 10/106:05 pmSTL - BWI

1 stop14h 16mFrontier

Mon 10/136:29 pmBWI - STL

1 stop15h 38mFrontier

Deal found 9/15

$191

Tue 10/1412:51 pmSTL - BWI

1 stop6h 57mAmerican Airlines

Wed 10/156:13 pmBWI - STL

1 stop6h 41mAmerican Airlines

Deal found 9/14

$158

Thu 10/231:41 pmSTL - BWI

1 stop17h 53mFrontier

Mon 10/276:29 pmBWI - STL

1 stop15h 38mFrontier

Deal found 9/14

$145

Fri 10/246:42 pmSTL - BWI

1 stop21h 55mFrontier

Sun 10/269:42 pmBWI - STL

1 stop12h 50mFrontier

Deal found 9/13

$159

Fri 10/314:52 pmSTL - BWI

1 stop6h 26mFrontier

Sun 11/25:00 amBWI - STL

1 stop5h 12mFrontier

Deal found 9/15

$183

One-way flights from St. Louis to Washington, D.C.
Search for one-way flight options from St. Louis to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated September 16, 2025.

Sun 1/1810:40 amSTL - DCA

Nonstop2h 05mAmerican Airlines

Deal found 9/14

$65

Tue 10/146:00 amSTL - DCA

Nonstop2h 10mAmerican Airlines

Deal found 9/14

$66

Tue 11/181:10 pmSTL - IAD

Nonstop2h 07mUnited Airlines

Deal found 9/15

$66

Fri 10/314:52 pmSTL - BWI

1 stop6h 26mFrontier

Deal found 9/14

$72

Thu 10/3011:07 amSTL - IAD

1 stop4h 27mFrontier

Deal found 9/14

$72

Sat 10/186:30 amSTL - BWI

1 stop6h 38mUnited Airlines

Deal found 9/14

$76

Mon 10/206:05 pmSTL - BWI

1 stop15h 15mFrontier

Deal found 9/13

$78

Fri 10/176:05 pmSTL - IAD

1 stop25h 48mFrontier

Deal found 9/13

$78

Sun 10/51:57 pmSTL - IAD

1 stop27h 27mFrontier

Deal found 9/15

$79

Mon 11/35:56 pmSTL - BWI

1 stop4h 39mAmerican Airlines

Deal found 9/14

$80

Sat 11/158:25 amSTL - IAD

Nonstop2h 08mUnited Airlines

Deal found 9/15

$80

Sun 9/214:00 pmSTL - IAD

1 stop7h 15mFrontier

Deal found 9/14

$83

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Fri 10/24

6:42 pm-5:37 pm

1 stop21h 55m

Baltimore/Washington

Sun 10/26

9:42 pm-9:32 am

1 stop12h 50m

$145

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Thu 10/23

1:41 pm-8:34 am

1 stop17h 53m

Baltimore/Washington

Mon 10/27

6:29 pm-9:07 am

1 stop15h 38m

$145

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 10/14

7:52 pm-12:04 pm

1 stop15h 12m

Washington, D.C. Reagan-National

Sat 10/18

7:00 am-9:07 am

1 stop27h 07m

$189

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Mon 10/27

4:10 pm-11:02 pm

1 stop5h 52m

Washington, D.C. Reagan-National

Tue 10/28

6:59 am-10:26 am

1 stop4h 27m

$197

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 11/8

8:43 am-11:55 am

Nonstop2h 12m

Washington, D.C. Reagan-National

Tue 11/11

7:50 am-9:20 am

Nonstop2h 30m

$197

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 10/14

6:14 pm-10:59 pm

1 stop3h 45m

Washington, D.C. Reagan-National

Wed 10/15

8:59 am-12:35 pm

1 stop4h 36m

$197

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Fri 10/31

5:15 pm-11:41 pm

1 stop5h 26m

Washington, D.C. Reagan-National

Sun 11/2

7:00 am-10:31 am

1 stop4h 31m

$197

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 11/6

6:00 am-12:45 pm

1 stop5h 45m

Washington, D.C. Reagan-National

Mon 11/10

6:18 pm-11:40 pm

1 stop6h 22m

$197

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 3/10

12:00 pm-6:34 pm

1 stop5h 34m

Washington, D.C. Reagan-National

Wed 3/11

1:45 pm-6:04 pm

1 stop5h 19m

$197

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 10/7

2:05 pm-7:18 pm

1 stop4h 13m

Washington, D.C. Reagan-National

Sat 10/11

8:00 am-12:35 pm

1 stop5h 35m

$197

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 60 results

...

The best insider tips for St. Louis to Washington, D.C. flights

Cheapflights partnered with top experts to bring you the best recommendations for your St. Louis to Washington, D.C. trip

Airports

STL

Security lines at STL are generally quick, averaging 5 to 10 minutes during off-peak times. Check real-time wait times online before heading to the airport.

DCA

DCA is easily accessible via the Metro, with a dedicated stop on the Yellow and Blue lines. It's the most affordable option for reaching downtown D.C.

IAD

The Silver Line Metro now reaches IAD in under 40 minutes, making it a cost-effective way to travel to and from the airport.

Our travel experts

Emily Zemler

Expert on DCA

Taryn White

Expert on STL

Ramsey Qubein

Expert on IAD

Best time to book a flight from St. Louis to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. 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 Washington, D.C.

How far ahead should I book a flight from St. Louis to Washington, D.C.?

Booking 51 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to Washington, D.C.. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from St. Louis to Washington, D.C.?

Currently, August is the cheapest month in which you can book a flight from St. Louis to Washington, D.C. (average of $292). Flying from St. Louis to Washington, D.C. in April is currently the most expensive (average of $337). 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 WAS?

It’s typically best to fly out from St. Louis to Washington, D.C. in the evening. Doing so could potentially save you 70% on the flight price compared to flying at noon, which is usually more expensive.

What is the cheapest day to fly from St. Louis to Washington, D.C.?

Travelers seeking maximum savings on their St. Louis to Washington, D.C. flight should consider departing on Tuesday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from St. Louis to Washington, D.C.

The most flights from STL to WAS are scheduled on a Monday (16 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (10 on average).

How much does it cost to fly round-trip from St. Louis to Washington, D.C.?

What’s the top layover airport for flights from St. Louis to Washington, D.C.?

Chicago (ORD) – chosen by Cheapflights users on 50% of 1-stop itineraries from St. Louis to Washington, D.C. on Cheapflights.

What’s the cheapest layover airport for flights from St. Louis to Washington, D.C.?

Denver (DEN) is the most affordable 1-stop option, with an average round-trip price of $294.

What’s the fastest layover option from St. Louis to Washington, D.C.?

Flights via Chicago (ORD) have the shortest average one-way travel time for 1-stop routes: 4h 56m.

Which airport typically offers the quickest layover for flights from St. Louis to Washington, D.C.?

Flights via Chicago (ORD) offer the fastest connection on this route, with an average layover time of 1h 28m.

Reviews of airlines servicing Washington, D.C.

Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from St. Louis to Washington, D.C. by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,242 reviews

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

4,242 reviews

Southwest

8.0

Very good

4,242 reviews

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

8.0

Very good

7,954 reviews

Southwest

8.0

Very good

4,242 reviews

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

8,929 reviews

Southwest

8.0

Very good

4,242 reviews

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

10,000 reviews

Southwest

8.0

Very good

4,242 reviews

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

3,172 reviews

Southwest

8.0

Very good

4,242 reviews

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

What airport do you fly from for flights from St. Louis to Washington, D.C.?
If you book a flight to Washington, D.C. 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. There are 13 flights from Lambert-St Louis to Washington, D.C. per day from 5 different airlines.
How long is the flight from St. Louis to Washington, D.C.?
There are many flights that can get you from St. Louis to Washington, D.C. in 2h 12m. Fly via Frontier, Delta, or American Airlines to get the fastest option. There are 717 mi between St. Louis and Washington, D.C.. Both multi-stop and nonstop flights can be found to your destination and back.
What are the cheapest airlines flying from St. Louis to Washington, D.C. round-trip?
Flying on American Airlines is currently your cheapest option to Washington, D.C., with prices starting at $129. Additional round-trip tickets that might be worth considering are offered by Delta and Southwest, with the lowest prices starting at $168 and $195, respectively. American Airlines is 57% cheaper than the average price of flights available within the next 90 days to this destination.
What are the cheapest airlines to fly from St. Louis to Washington, D.C. one-way?
For one-way options, check prices for American Airlines. According to our data, you can fly for as low as $66. Users have also found prices from $72 and $76 on Frontier and United Airlines, respectively.
What are the most popular routes from St. Louis to Washington, D.C.?
The most popular route from St. Louis to Washington, D.C. is Lambert-St Louis - Washington, D.C. Dulles Intl. You may also consider Lambert-St Louis - Washington, D.C. Reagan-National or Lambert-St Louis - Baltimore/Washington.
What are the most reliable airlines from St. Louis to Washington, D.C.?
The top 3 most reliable airlines when flying from St. Louis to Washington, D.C. are Avianca (84%), Copa Airlines (84%) and Lufthansa (79%).
What are the cheapest flights from St. Louis to Washington, D.C.?
While on average a flight from St. Louis to Washington, D.C. is generally $638, our data shows the cheapest flight currently is $153. When looking at the most popular route, (Lambert-St Louis - Washington, D.C. Dulles Intl), you can expect to pay $197 for that flight.
Can I find deals for flights from St. Louis to Washington, D.C. that include hotel bookings?
Yes. In addition to deals on St. Louis to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from St. Louis to Washington, D.C.?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Washington, D.C..
Can I find deals for business class flights from St. Louis to Washington, D.C.?
Yes. Cheapflights offers flight deals from St. Louis to Washington, D.C. 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 Washington, D.C.?
Currently, August is the cheapest month in which you can book a flight from St. Louis to Washington, D.C. (average of $292). Flying from St. Louis to Washington, D.C. in April is currently the most expensive (average of $337). 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.

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Woodbridge

Alexandria

Arlington

Tysons

Silver Spring

Springfield

Gaithersburg

Fredericksburg

Linthicum Heights

Fairfax

Falls Church

Owings Mills

Manassas

Rockville

Hanover

Oxon Hill

Laurel

Towson

Dundalk

National Harbor

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Top 5 airlines flying from St. Louis to Washington, D.C.

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$124	Average$218	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$129	Average$328	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$168	Average$278	FlexibilityNo cancel fee	On-timeN/A
Southwest	Cheapest$193	Average$334	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$211	Average$445	FlexibilityNo cancel fee	On-time69%

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$65+ Cheap flights from St. Louis (STL) to Washington, D.C. (WAS)

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 1/18. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheapflights Tip: The best prices from Lambert-St Louis to Washington, D.C. are usually found in August or November, booked 51 days in advance, depart on a Friday or Tuesday and return on a Wednesday

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Cheapest flights from St. Louis to Washington, D.C.Explore the most affordable flight options available from St. Louis to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

Explore the most affordable flight options available from St. Louis to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

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The best insider tips for St. Louis to Washington, D.C. flights

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Best time to book a flight from St. Louis to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. from St. Louis with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Washington, D.C.

How far ahead should I book a flight from St. Louis to Washington, D.C.?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Washington, D.C.. Price data was last updated on September 12, 2025.

What is the cheapest month to book a flight from St. Louis to Washington, D.C.?

What is the cheapest time of day to fly from STL to WAS?

Find hourly flight availability from St. Louis to Washington, D.C.. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 16, 2025.

What is the cheapest day to fly from St. Louis to Washington, D.C.?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Washington, D.C.. Price data was last updated on September 14, 2025.

Weekly flight availability from St. Louis to Washington, D.C.

How much does it cost to fly round-trip from St. Louis to Washington, D.C.?

What’s the top layover airport for flights from St. Louis to Washington, D.C.?

Share of 1-stop round-trip flights from St. Louis to Washington, D.C. chosen by Cheapflights users in the past 12 months, using the same layover each way.

What’s the cheapest layover airport for flights from St. Louis to Washington, D.C.?

Average round-trip fare for 1-stop flights from St. Louis to Washington, D.C., chosen by Cheapflights users in the past 12 months, with the same layover each way.

What’s the fastest layover option from St. Louis to Washington, D.C.?

Shortest average travel time for 1-stop one-way flights from St. Louis to Washington, D.C., based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Which airport typically offers the quickest layover for flights from St. Louis to Washington, D.C.?

Average layover duration for 1-stop one-way flights from St. Louis to Washington, D.C., chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Reviews of airlines servicing Washington, D.C.

Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from St. Louis to Washington, D.C. by reading reviews from past customers. Users have also rated airlines 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 Washington, D.C.. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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What are the cheapest airlines flying from St. Louis to Washington, D.C. round-trip?

What are the cheapest airlines to fly from St. Louis to Washington, D.C. one-way?

What are the most popular routes from St. Louis to Washington, D.C.?

What are the most reliable airlines from St. Louis to Washington, D.C.?

What are the cheapest flights from St. Louis to Washington, D.C.?

Can I find deals for flights from St. Louis to Washington, D.C. that include hotel bookings?

How can I find direct flights from St. Louis to Washington, D.C.?

Can I find deals for business class flights from St. Louis to Washington, D.C.?

What is the cheapest month to book a flight from St. Louis to Washington, D.C.?

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Top 5 airlines flying from St. Louis to Washington, D.C.

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Cheapest flights from St. Louis to Washington, D.C.
Explore the most affordable flight options available from St. Louis to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.