How popular is this Washington, D.C. to St. Louis flight route?

Within the past month, 13 users have taken a look at flights from Washington, D.C. to Lambert-St Louis.

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

Our cheapest airline available from Washington, D.C. to St. Louis is Spirit Airlines. Our recent data shows that you can find tickets from as low as $140 on this airline. Additional options worth looking into are American Airlines and Delta, starting at $206 and $208 round-trip. These flights start at 57% lower than the current average price 3 months from now.

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

To fly one-way, consider booking your trip with Spirit Airlines, which is currently one of the cheapest options available, starting at $63. Southwest flights start at $99 while deals on United Airlines start at $109 one-way.

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

When deciding which route to take from Washington, D.C. to St. Louis consider Washington, D.C. Dulles Intl - Lambert-St Louis, Baltimore/Washington - Lambert-St Louis or Washington, D.C. Reagan-National - Lambert-St Louis as they are the most popular.

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

The cheapest flight price from Washington, D.C. to St. Louis is $98. On average you can expect to pay $298. The most popular route, (Washington, D.C. Dulles Intl - Lambert-St Louis), can usually be booked for $177.

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

When booking a flight from Washington, D.C. to St. Louis, you may want to consider flying on American Airlines, Delta or Frontier as they are the most popular for this route.

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

Saturday flights are found to be more expensive to fly from Washington, D.C. to St. Louis. 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 St. Louis.

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

Find a great deal and save up to 160% by booking at least 29 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Washington, D.C. to St. Louis within the next two weeks, with the cheapest ticket starting at $414.

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

The best pricing can be found in the month of August. Prices to St. Louis from Washington, D.C. average $332. You can even find prices in August for less than $332, as users have found deals to St. Louis from as low as $169. The month of March appears to be one of the more expensive times to travel to St. Louis from Washington, D.C.. Flying in the targeted month can save you up to 12%.

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

Lambert-St Louis (STL), located 12.7 mi from the city center, is the airport you fly into when you book flights from Washington, D.C. to St. Louis. 5 airlines have flights to Lambert-St Louis from Washington, D.C. on a regular basis. Booking flights from Washington, D.C. to Lambert-St Louis should not be difficult; the airport handles an average of 15 inbound flights from Washington, D.C. per day.

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

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

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

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

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

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

$63+ Flights from Washington, D.C. to St. Louis

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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

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Cheapflights Tip: The best prices from Washington, D.C. to Lambert-St Louis are usually found in August or May, booked 61 days in advance, depart on a Wednesday or Friday and return on a Friday

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

Round-trip from	$140 (Mytrip)
One-way from	$63 (FlightHub)
Popular in	March
Cheapest in	August
Average price	$340
Good round-trip deal	$238 or less
Good one-way deal	$166 or less

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

Search Deals

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

Search Deals

Highest demand for flights based on searches. 6% potential increase in price ($22 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in June 2025

Search Deals

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

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

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

Cheapest flights from Washington, D.C. to St. Louis
Explore the most affordable flight options available from Washington, D.C. to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

Thu 7/102:50 pmBWI - STL

1 stop20h 02mSpirit Airlines

Sun 7/1310:47 amSTL - BWI

1 stop19h 52mSpirit Airlines

Deal found 6/11

$140

Fri 7/42:59 pmDCA - STL

Nonstop2h 29mAmerican Airlines

Tue 7/86:00 amSTL - DCA

Nonstop2h 10mAmerican Airlines

Deal found 6/10

$206

Sat 9/276:10 amIAD - STL

1 stop4h 25mDelta

Mon 9/295:40 pmSTL - IAD

1 stop5h 27mDelta

Deal found 6/11

$208

Sat 9/610:11 amDCA - STL

1 stop5h 17mDelta

Mon 9/85:11 pmSTL - DCA

1 stop5h 35mDelta

Deal found 6/12

$208

Wed 7/306:35 amIAD - STL

1 stop6h 52mUnited Airlines

Wed 8/66:33 amSTL - IAD

1 stop4h 22mUnited Airlines

Deal found 6/10

$213

Wed 7/308:30 amDCA - STL

1 stop4h 57mUnited Airlines

Wed 8/65:00 amSTL - DCA

1 stop4h 56mUnited Airlines

Deal found 6/10

$213

Mon 6/306:35 pmDCA - STL

Nonstop2h 15mSouthwest

Wed 7/25:45 pmSTL - DCA

1 stop5h 05mSouthwest

Deal found 6/10

$214

Tue 8/267:58 amBWI - STL

1 stop6h 53mAmerican Airlines

Wed 8/276:06 amSTL - BWI

1 stop4h 46mAmerican Airlines

Deal found 6/11

$217

Sat 7/266:10 amIAD - STL

1 stop8h 49mFrontier

Sat 8/22:52 pmSTL - IAD

1 stop7h 27mFrontier

Deal found 6/11

$221

Sat 7/267:20 amBWI - STL

1 stop7h 39mFrontier

Sat 8/22:52 pmSTL - BWI

1 stop8h 03mFrontier

Deal found 6/11

$221

Thu 7/102:50 pmBWI - STL

1 stop20h 02mMultiple Airlines

Mon 7/145:40 pmSTL - BWI

1 stop21h 06mMultiple Airlines

Deal found 6/10

$226

Wed 7/305:40 pmBWI - STL

1 stop4h 20mSouthwest

Mon 8/45:05 pmSTL - BWI

Nonstop2h 00mSouthwest

Deal found 6/11

$247

Best flights from Washington, D.C. to St. Louis
Discover carefully curated flight deals from Washington, D.C. to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 12, 2025.

Thu 7/102:50 pmBWI - STL

1 stop20h 02mSpirit Airlines

Sun 7/1310:47 amSTL - BWI

1 stop19h 52mSpirit Airlines

Deal found 6/11

$140

Fri 7/42:59 pmDCA - STL

Nonstop2h 29mAmerican Airlines

Tue 7/86:00 amSTL - DCA

Nonstop2h 10mAmerican Airlines

Deal found 6/10

$206

Sat 9/68:00 amDCA - STL

1 stop5h 31mDelta

Mon 9/85:11 pmSTL - DCA

1 stop5h 35mDelta

Deal found 6/10

$208

Wed 7/306:35 amIAD - STL

1 stop6h 52mUnited Airlines

Wed 8/66:33 amSTL - IAD

1 stop4h 22mUnited Airlines

Deal found 6/10

$213

Mon 6/306:35 pmDCA - STL

Nonstop2h 15mSouthwest

Wed 7/25:45 pmSTL - DCA

1 stop5h 05mSouthwest

Deal found 6/10

$214

Sat 7/266:10 amIAD - STL

1 stop8h 49mFrontier

Sat 8/22:52 pmSTL - IAD

1 stop7h 27mFrontier

Deal found 6/11

$221

Wed 7/28:36 pmBWI - STL

1 stop23h 48mMultiple Airlines

Sun 7/1310:47 amSTL - BWI

1 stop19h 52mMultiple Airlines

Deal found 6/10

$263

Wed 7/308:30 amDCA - STL

1 stop4h 57mUnited Airlines

Wed 8/65:00 amSTL - DCA

1 stop4h 56mUnited Airlines

Deal found 6/10

$213

Tue 8/267:58 amBWI - STL

1 stop6h 53mAmerican Airlines

Wed 8/276:06 amSTL - BWI

1 stop4h 46mAmerican Airlines

Deal found 6/11

$217

Sat 7/267:20 amBWI - STL

1 stop7h 39mFrontier

Sat 8/22:52 pmSTL - BWI

1 stop8h 03mFrontier

Deal found 6/11

$221

Wed 7/306:00 amIAD - STL

1 stop4h 33mDelta

Mon 8/43:41 pmSTL - IAD

1 stop5h 35mDelta

Deal found 6/11

$223

Wed 7/305:40 pmBWI - STL

1 stop4h 20mSouthwest

Mon 8/45:05 pmSTL - BWI

Nonstop2h 00mSouthwest

Deal found 6/10

$247

Last-minute flights from Washington, D.C. to St. Louis
Discover last-minute flight deals from Washington, D.C. to St. Louis. Data last updated June 12, 2025 and is based on user searches.

Tue 6/177:00 amDCA - STL

1 stop27h 12mFrontier

Fri 6/207:29 pmSTL - DCA

1 stop15h 31mFrontier

Deal found 6/11

$389

Tue 6/178:14 pmIAD - STL

1 stop4h 45mAmerican Airlines

Tue 6/244:41 pmSTL - IAD

1 stop6h 18mAmerican Airlines

Deal found 6/10

$469

Thu 6/196:00 pmDCA - STL

1 stop5h 45mUnited Airlines

Wed 6/256:30 amSTL - DCA

1 stop4h 29mUnited Airlines

Deal found 6/10

$469

Fri 6/208:00 amDCA - STL

Nonstop2h 26mAmerican Airlines

Tue 7/16:00 amSTL - DCA

Nonstop2h 05mAmerican Airlines

Deal found 6/11

$354

Fri 6/205:20 pmBWI - STL

1 stop16h 52mMultiple Airlines

Sun 6/226:36 pmSTL - BWI

1 stop11h 28mMultiple Airlines

Deal found 6/10

$379

Fri 6/203:31 pmIAD - STL

1 stop7h 03mDelta

Tue 7/110:48 amSTL - IAD

1 stop4h 45mDelta

Deal found 6/11

$409

Fri 6/206:05 amDCA - STL

1 stop4h 32mDelta

Tue 7/15:23 pmSTL - DCA

1 stop5h 23mDelta

Deal found 6/11

$409

Sat 6/211:29 pmIAD - STL

1 stop11h 24mFrontier

Sun 6/228:44 pmSTL - IAD

1 stop12h 25mFrontier

Deal found 6/10

$282

Sat 6/217:20 amBWI - STL

1 stop7h 47mFrontier

Thu 6/262:36 pmSTL - BWI

1 stop8h 50mFrontier

Deal found 6/9

$325

Sat 6/218:40 amIAD - STL

Nonstop2h 16mUnited Airlines

Tue 6/248:15 amSTL - IAD

Nonstop2h 08mUnited Airlines

Deal found 6/9

$449

Sat 6/216:55 amDCA - STL

2 stops9h 10mSouthwest

Tue 6/247:40 amSTL - DCA

1 stop5h 40mSouthwest

Deal found 6/9

$509

Sun 6/222:08 pmBWI - STL

1 stop3h 56mSpirit Airlines

Mon 6/2311:28 amSTL - BWI

1 stop7h 05mSpirit Airlines

Deal found 6/10

$349

One-way flights from Washington, D.C. to St. Louis
Search for one-way flight options from Washington, D.C. to St. Louis. Find affordable one-way fares based on user searches. Data last updated June 12, 2025.

Thu 9/410:46 pmBWI - STL

1 stop10h 03mSpirit Airlines

Deal found 6/10

$63

Thu 8/76:20 amBWI - STL

Nonstop2h 10mSouthwest

Deal found 6/10

$99

Tue 8/2610:51 amBWI - STL

1 stop5h 53mUnited Airlines

Deal found 6/10

$109

Wed 8/138:40 amIAD - STL

Nonstop2h 19mUnited Airlines

Deal found 6/10

$115

Thu 7/247:44 amDCA - STL

Nonstop2h 26mAmerican Airlines

Deal found 6/12

$115

Mon 9/110:30 amDCA - STL

1 stop6h 14mUnited Airlines

Deal found 6/10

$117

Fri 9/53:40 pmDCA - STL

1 stop4h 05mSouthwest

Deal found 6/11

$120

Sat 8/3012:23 pmBWI - STL

1 stop5h 13mDelta

Deal found 6/10

$121

Sat 8/96:34 amIAD - STL

1 stop6h 37mAmerican Airlines

Deal found 6/11

$126

Thu 8/1411:04 amIAD - STL

2 stops21h 45mMultiple Airlines

Deal found 6/10

$129

Tue 9/95:45 amIAD - STL

2 stops13h 05mSouthwest

Deal found 6/10

$135

Thu 7/106:00 amDCA - STL

1 stop4h 41mDelta

Deal found 6/10

$135

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 7/10

2:50 pm-9:52 am

1 stop20h 02m

Lambert-St Louis

Sun 7/13

10:47 am-7:39 am

1 stop19h 52m

$140

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Fri 7/4

2:59 pm-4:28 pm

Nonstop2h 29m

Lambert-St Louis

Tue 7/8

6:00 am-9:10 am

Nonstop2h 10m

$206

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 9/27

6:10 am-9:35 am

1 stop4h 25m

Lambert-St Louis

Mon 9/29

5:40 pm-12:07 am

1 stop5h 27m

$208

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 9/6

10:11 am-2:28 pm

1 stop5h 17m

Lambert-St Louis

Mon 9/8

5:11 pm-11:46 pm

1 stop5h 35m

$208

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Wed 7/30

6:35 am-12:27 pm

1 stop6h 52m

Lambert-St Louis

Wed 8/6

6:33 am-11:55 am

1 stop4h 22m

$213

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Wed 7/30

8:30 am-12:27 pm

1 stop4h 57m

Lambert-St Louis

Wed 8/6

5:00 am-10:56 am

1 stop4h 56m

$213

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 6/30

6:35 pm-7:50 pm

Nonstop2h 15m

Lambert-St Louis

Wed 7/2

5:45 pm-11:50 pm

1 stop5h 05m

$214

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 8/26

7:58 am-1:51 pm

1 stop6h 53m

Lambert-St Louis

Wed 8/27

6:06 am-11:52 am

1 stop4h 46m

$217

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 7/26

6:10 am-1:59 pm

1 stop8h 49m

Lambert-St Louis

Sat 8/2

2:52 pm-11:19 pm

1 stop7h 27m

$221

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Sat 7/26

7:20 am-1:59 pm

1 stop7h 39m

Lambert-St Louis

Sat 8/2

2:52 pm-11:55 pm

1 stop8h 03m

$221

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 36 results

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

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

Airports

DCA

DCA is easily accessible via the Metro, offering a clean and affordable way to reach the airport from D.C. and nearby Maryland.

IAD

IAD's Aerotrain connects the main terminal to concourses, but pay attention to signage for the correct train direction.

STL

STL's MetroLink offers a convenient and economical way to reach downtown St. Louis in about 40 minutes.

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 Washington, D.C. to St. Louis

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

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

To ensure you get the cheapest price possible for a flight from Washington, D.C. to St. Louis, you should look to book at least 61 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, August is the cheapest month in which you can book a flight from Washington, D.C. to St. Louis (average of $311). Flying from Washington, D.C. to St. Louis in March is currently the most expensive (average of $356). 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 WAS to STL?

It’s optimal to fly from Washington, D.C. to St. Louis at noon. By choosing this option you can save up to 20% on the cost of your flight, compared to a flight in the afternoon.

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

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

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

The most flights from WAS to STL are scheduled on a Monday (17 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (9 on average).

Rainfall in St. Louis by month

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

If weather is an important factor for your trip to St. Louis, 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 32.0 F).

Reviews of airlines servicing St. Louis

To help decide which airline to fly from Washington, D.C. to St. Louis, see what other customers have to say about Southwest, Delta and United Airlines. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Southwest

8.0

Very good

4,287 reviews

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Delta

8.0

Very good

7,946 reviews

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

United Airlines

7.4

Good

8,790 reviews

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

American Airlines

7.2

Good

10,000 reviews

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Sun Country Air

6.9

Okay

345 reviews

Southwest

8.0

Very good

4,287 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Related info for your journey

What airport do you fly into for flights to St. Louis from Washington, D.C.?
Lambert-St Louis (STL), located 12.7 mi from the city center, is the airport you fly into when you book flights from Washington, D.C. to St. Louis. 5 airlines have flights to Lambert-St Louis from Washington, D.C. on a regular basis. Booking flights from Washington, D.C. to Lambert-St Louis should not be difficult; the airport handles an average of 15 inbound flights from Washington, D.C. per day.
How popular is this Washington, D.C. to St. Louis flight route?
Within the past month, 13 users have taken a look at flights from Washington, D.C. to Lambert-St Louis.
What are the cheapest airlines flying from Washington, D.C. to St. Louis round-trip?
Our cheapest airline available from Washington, D.C. to St. Louis is Spirit Airlines. Our recent data shows that you can find tickets from as low as $140 on this airline. Additional options worth looking into are American Airlines and Delta, starting at $206 and $208 round-trip. These flights start at 57% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from Washington, D.C. to St. Louis one-way?
To fly one-way, consider booking your trip with Spirit Airlines, which is currently one of the cheapest options available, starting at $63. Southwest flights start at $99 while deals on United Airlines start at $109 one-way.
What are the most popular routes from Washington, D.C. to St. Louis?
When deciding which route to take from Washington, D.C. to St. Louis consider Washington, D.C. Dulles Intl - Lambert-St Louis, Baltimore/Washington - Lambert-St Louis or Washington, D.C. Reagan-National - Lambert-St Louis as they are the most popular.
What are the cheapest flights from Washington, D.C. to St. Louis?
The cheapest flight price from Washington, D.C. to St. Louis is $98. On average you can expect to pay $298. The most popular route, (Washington, D.C. Dulles Intl - Lambert-St Louis), can usually be booked for $177.
Can I find deals for flights from Washington, D.C. to St. Louis that include hotel bookings?
Yes. In addition to deals on Washington, D.C. to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Washington, D.C. to St. Louis?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to St. Louis.
Can I find deals for business class flights from Washington, D.C. to St. Louis?
Yes. Cheapflights offers flight deals from Washington, D.C. to St. Louis 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 Washington, D.C. to St. Louis?
Currently, August is the cheapest month in which you can book a flight from Washington, D.C. to St. Louis (average of $311). Flying from Washington, D.C. to St. Louis in March is currently the most expensive (average of $356). 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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Eureka

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

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$108	Average$221	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$166	Average$312	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$169	Average$289	FlexibilityNo cancel fee	On-timeN/A
Southwest	Cheapest$197	Average$350	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$223	Average$400	FlexibilityNo cancel fee	On-time69%

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$63+ Cheap flights from Washington, D.C. (WAS) to St. Louis (STL)

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 9/4. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Washington, D.C. to St. Louis with Cheapflights

1. Tell us where you want to go

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Cheapflights Tip: The best prices from Washington, D.C. to Lambert-St Louis are usually found in August or May, booked 61 days in advance, depart on a Wednesday or Friday and return on a Friday

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Cheapest flights from Washington, D.C. to St. LouisExplore the most affordable flight options available from Washington, D.C. to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

Explore the most affordable flight options available from Washington, D.C. to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

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Related info for your journey

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Cheapest flights from Washington, D.C. to St. Louis
Explore the most affordable flight options available from Washington, D.C. to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.