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

This flight path from Lambert-St Louis to Washington, D.C. was viewed by 9 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

Flying on Frontier is currently your cheapest option to Washington, D.C., with prices starting at $198. Additional round-trip tickets that might be worth considering are offered by American Airlines and Southwest, with the lowest prices starting at $213 and $214, respectively. Frontier is 33% 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 Frontier. According to our data, you can fly for as low as $96. Users have also found prices from $99 and $100 on Southwest 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 - Baltimore/Washington or Lambert-St Louis - Washington, D.C. Reagan-National.

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 $284, our data shows the cheapest flight currently is $88. When looking at the most popular route, (Lambert-St Louis - Washington, D.C. Dulles Intl), you can expect to pay $217 for that flight.

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

American Airlines, Delta and Frontier 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 23 days in advance to save up to 177% 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 23 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 $424, or $567 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, November can be a great choice for travel to Washington, D.C.. Flights to Washington, D.C. from St. Louis in November are about $298 on average during November, but can be found for as low as $136.

Most accurate provider : When it comes to deals on St. Louis-Washington, D.C. flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Washington, D.C. flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Washington, D.C. flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on St. Louis-Washington, D.C. flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Washington, D.C. flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 11 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.

$96+ Flights from St. Louis to Washington, D.C.

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

1. Tell us where you want to go

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

2. Select your favorite providers

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

3. Compare prices and book

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

Cheapflights Tip: The best prices from Lambert-St Louis to Washington, D.C. are usually found in November or August, booked 63 days in advance, depart on a Friday or Thursday and return on a Wednesday

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

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$198 (Booking.com)
One-way from	$96 (Mytrip)
Popular in	March
Cheapest in	November
Average price	$304
Good round-trip deal	$247 or less
Good one-way deal	$141 or less

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

Search Deals

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

Search Deals

From Lambert-St Louis to 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. 8% potential increase in price ($29 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 April 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).

Search Deals

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 April 11, 2025.

Sun 4/134:57 pmSTL - BWI

1 stop20h 45mFrontier

Tue 4/153:53 pmBWI - STL

1 stop8h 53mFrontier

Deal found 4/9

$198

Thu 5/810:10 amSTL - BWI

1 stop7h 42mMultiple Airlines

Thu 5/159:16 pmBWI - STL

1 stop27h 58mMultiple Airlines

Deal found 4/10

$207

Fri 5/26:53 pmSTL - DCA

1 stop21h 06mFrontier

Sun 5/47:00 amDCA - STL

1 stop27h 09mFrontier

Deal found 4/9

$208

Sun 5/45:45 pmSTL - IAD

1 stop21h 51mFrontier

Sun 5/115:26 pmIAD - STL

1 stop7h 40mFrontier

Deal found 4/10

$208

Fri 6/275:54 pmSTL - DCA

Nonstop2h 01mAmerican Airlines

Wed 7/28:00 amDCA - STL

Nonstop2h 26mAmerican Airlines

Deal found 4/10

$213

Thu 5/84:35 pmSTL - DCA

1 stop5h 25mSouthwest

Thu 5/293:00 pmDCA - STL

Nonstop2h 15mSouthwest

Deal found 4/10

$214

Sat 5/245:17 pmSTL - IAD

1 stop4h 37mDelta

Sun 5/257:15 amIAD - STL

1 stop5h 49mDelta

Deal found 4/11

$217

Thu 5/291:09 pmSTL - DCA

1 stop6h 27mDelta

Mon 6/26:00 amDCA - STL

1 stop4h 00mDelta

Deal found 4/10

$233

Sun 6/298:15 amSTL - IAD

Nonstop2h 08mUnited Airlines

Tue 7/86:35 amIAD - STL

1 stop6h 52mUnited Airlines

Deal found 4/10

$239

Tue 5/69:36 amSTL - BWI

1 stop6h 01mAmerican Airlines

Wed 5/75:00 amBWI - STL

1 stop4h 56mAmerican Airlines

Deal found 4/10

$245

Thu 5/2910:10 amSTL - BWI

1 stop11h 31mSpirit Airlines

Sat 5/3111:54 amBWI - STL

1 stop22h 21mSpirit Airlines

Deal found 4/10

$246

Sat 5/248:45 pmSTL - BWI

Nonstop2h 00mSouthwest

Sun 5/255:20 pmBWI - STL

1 stop6h 15mSouthwest

Deal found 4/10

$273

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 April 11, 2025.

Tue 4/295:41 pmSTL - BWI

1 stop20h 00mFrontier

Fri 5/26:12 pmBWI - STL

1 stop16h 47mFrontier

Deal found 4/10

$198

Thu 5/810:10 amSTL - BWI

1 stop7h 42mMultiple Airlines

Thu 5/159:16 pmBWI - STL

1 stop27h 58mMultiple Airlines

Deal found 4/10

$207

Fri 6/275:54 pmSTL - DCA

Nonstop2h 01mAmerican Airlines

Wed 7/28:00 amDCA - STL

Nonstop2h 26mAmerican Airlines

Deal found 4/10

$213

Thu 5/84:35 pmSTL - DCA

1 stop5h 25mSouthwest

Thu 5/293:00 pmDCA - STL

Nonstop2h 15mSouthwest

Deal found 4/10

$214

Sat 5/245:17 pmSTL - IAD

1 stop4h 37mDelta

Sun 5/255:40 pmIAD - STL

1 stop6h 58mDelta

Deal found 4/10

$217

Sun 6/298:15 amSTL - IAD

Nonstop2h 08mUnited Airlines

Tue 7/86:35 amIAD - STL

1 stop6h 52mUnited Airlines

Deal found 4/10

$239

Thu 5/2910:10 amSTL - BWI

1 stop11h 31mSpirit Airlines

Sat 5/3111:54 amBWI - STL

1 stop22h 21mSpirit Airlines

Deal found 4/10

$246

Fri 5/26:53 pmSTL - DCA

1 stop21h 06mFrontier

Sun 5/117:00 amDCA - STL

1 stop27h 09mFrontier

Deal found 4/10

$208

Sun 5/45:45 pmSTL - IAD

1 stop21h 51mFrontier

Sun 5/115:26 pmIAD - STL

1 stop7h 40mFrontier

Deal found 4/10

$208

Thu 5/291:09 pmSTL - DCA

1 stop6h 27mDelta

Mon 6/26:00 amDCA - STL

1 stop4h 00mDelta

Deal found 4/10

$233

Tue 5/69:36 amSTL - BWI

1 stop6h 01mAmerican Airlines

Wed 5/75:00 amBWI - STL

1 stop4h 56mAmerican Airlines

Deal found 4/10

$245

Sat 5/248:45 pmSTL - BWI

Nonstop2h 00mSouthwest

Sun 5/2512:35 pmBWI - STL

1 stop6h 30mSouthwest

Deal found 4/11

$273

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 April 11, 2025 and is based on user searches.

Sun 4/134:57 pmSTL - BWI

1 stop20h 45mFrontier

Tue 4/153:53 pmBWI - STL

1 stop8h 53mFrontier

Deal found 4/9

$198

Wed 4/164:57 pmSTL - IAD

1 stop16h 58mFrontier

Thu 5/155:26 pmIAD - STL

1 stop7h 40mFrontier

Deal found 4/10

$297

Wed 4/169:20 amSTL - BWI

3 stops32h 12mMultiple Airlines

Thu 5/1512:20 pmBWI - STL

1 stop24h 17mMultiple Airlines

Deal found 4/10

$510

Wed 4/167:03 pmSTL - BWI

1 stop4h 21mAmerican Airlines

Mon 4/285:55 pmBWI - STL

2 stops6h 38mAmerican Airlines

Deal found 4/10

$860

Thu 4/1710:40 amSTL - DCA

1 stop4h 01mUnited Airlines

Sun 4/207:00 amDCA - STL

2 stops11h 23mUnited Airlines

Deal found 4/10

$611

Fri 4/188:05 amSTL - DCA

Nonstop2h 00mSouthwest

Sun 4/2012:00 pmDCA - STL

Nonstop2h 15mSouthwest

Deal found 4/10

$354

Fri 4/186:30 amSTL - IAD

1 stop4h 14mUnited Airlines

Sun 4/206:20 amIAD - STL

1 stop5h 43mUnited Airlines

Deal found 4/9

$374

Fri 4/181:48 pmSTL - IAD

1 stop4h 53mAmerican Airlines

Sun 4/202:12 pmIAD - STL

1 stop5h 00mAmerican Airlines

Deal found 4/10

$404

Fri 4/186:00 amSTL - DCA

1 stop5h 46mDelta

Sun 4/206:00 amDCA - STL

1 stop4h 45mDelta

Deal found 4/9

$423

Sat 4/196:51 pmSTL - DCA

1 stop16h 13mFrontier

Tue 4/221:00 pmDCA - STL

1 stop22h 01mFrontier

Deal found 4/10

$290

Sat 4/1910:48 amSTL - DCA

Nonstop2h 02mAmerican Airlines

Tue 4/223:59 pmDCA - STL

Nonstop2h 22mAmerican Airlines

Deal found 4/10

$389

Sat 4/196:00 amSTL - IAD

1 stop4h 23mDelta

Tue 4/2212:29 pmIAD - STL

1 stop6h 33mDelta

Deal found 4/10

$423

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 April 11, 2025.

Sat 5/178:15 pmSTL - DCA

1 stop14h 52mFrontier

Deal found 4/10

$96

Tue 4/295:41 pmSTL - BWI

1 stop20h 00mFrontier

Deal found 4/10

$96

Wed 5/145:45 pmSTL - IAD

1 stop21h 51mFrontier

Deal found 4/10

$96

Fri 5/303:55 pmSTL - DCA

Nonstop2h 00mSouthwest

Deal found 4/10

$99

Wed 5/286:30 amSTL - IAD

1 stop6h 58mUnited Airlines

Deal found 4/10

$100

Sat 5/1710:10 amSTL - BWI

1 stop7h 42mSpirit Airlines

Deal found 4/10

$101

Sat 7/55:23 pmSTL - DCA

1 stop4h 17mDelta

Deal found 4/10

$109

Sat 5/245:40 pmSTL - IAD

1 stop4h 55mDelta

Deal found 4/10

$109

Tue 5/135:12 amSTL - DCA

Nonstop2h 03mAmerican Airlines

Deal found 4/10

$115

Wed 5/285:00 amSTL - BWI

1 stop4h 13mUnited Airlines

Deal found 4/10

$123

Tue 5/275:40 pmSTL - BWI

1 stop6h 08mDelta

Deal found 4/10

$128

Tue 5/208:10 pmSTL - BWI

Nonstop2h 00mSouthwest

Deal found 4/10

$132

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

Sun 4/13

4:57 pm-2:42 pm

1 stop20h 45m

Baltimore/Washington

Tue 4/15

3:53 pm-11:46 pm

1 stop8h 53m

$198

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Thu 5/8

10:10 am-6:52 pm

1 stop7h 42m

Baltimore/Washington

Thu 5/15

9:16 pm-12:14 am

1 stop27h 58m

$207

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Fri 5/2

6:53 pm-4:59 pm

1 stop21h 06m

Washington, D.C. Reagan-National

Sun 5/4

7:00 am-9:09 am

1 stop27h 09m

$208

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sun 5/4

5:45 pm-4:36 pm

1 stop21h 51m

Washington, D.C. Dulles Intl

Sun 5/11

5:26 pm-12:06 am

1 stop7h 40m

$208

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Fri 6/27

5:54 pm-8:55 pm

Nonstop2h 01m

Washington, D.C. Reagan-National

Wed 7/2

8:00 am-9:26 am

Nonstop2h 26m

$213

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 5/8

4:35 pm-11:00 pm

1 stop5h 25m

Washington, D.C. Reagan-National

Thu 5/29

3:00 pm-4:15 pm

Nonstop2h 15m

$214

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sat 5/24

5:17 pm-10:54 pm

1 stop4h 37m

Washington, D.C. Dulles Intl

Sun 5/25

7:15 am-12:04 pm

1 stop5h 49m

$217

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 5/29

1:09 pm-8:36 pm

1 stop6h 27m

Washington, D.C. Reagan-National

Mon 6/2

6:00 am-9:00 am

1 stop4h 00m

$233

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sun 6/29

8:15 am-11:23 am

Nonstop2h 08m

Washington, D.C. Dulles Intl

Tue 7/8

6:35 am-12:27 pm

1 stop6h 52m

$239

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Tue 5/6

9:36 am-4:37 pm

1 stop6h 01m

Baltimore/Washington

Wed 5/7

5:00 am-8:56 am

1 stop4h 56m

$245

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/10

Showing 1-10 of 37 results

Compare providers for flights from St. Louis to Washington, D.C.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Washington, D.C. in April.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Gotogate	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on St. Louis-Washington, D.C. flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Washington, D.C. flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Washington, D.C. flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on St. Louis-Washington, D.C. flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Washington, D.C. flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

Airlines

Southwest

Enjoy free snacks and non-alcoholic drinks, plus Wi-Fi for a fee on board.

Two free checked bags included, even oversized like skis or golf clubs.

Read more about Southwestby Marisa Garcia

United Airlines

Basic Economy allows a personal item only; no carry-on bags permitted.

Economy Plus offers extra legroom seats towards the front of the cabin.

Read more about United Airlinesby Harriet Baskas

Airports

STL

Expect security screening at STL to take 5-10 minutes during off-peak times. Check real-time wait times online before heading to the airport.

DCA

DCA is easily accessible via public transportation. The Metro stop on the Yellow and Blue lines is clean, affordable, and convenient for reaching D.C. destinations.

IAD

The Washington Metro Silver line reaches IAD in under 40 minutes, making it a cheap and efficient way to get to the airport.

Our travel experts

Marisa Garcia

Expert on Southwest

Harriet Baskas

Expert on United Airlines

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 63 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 $241). Flying from St. Louis to Washington, D.C. 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 WAS?

It’s typically best to fly out from St. Louis to Washington, D.C. in the evening. Doing so could potentially save you 73% 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 Friday evenings when fares are most often at their lowest. Saturday 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 (13 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 on average).

Rainfall in Washington, D.C. by month

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.

Temperature in Washington, D.C. by month

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).

Reviews of airlines servicing Washington, D.C.

Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from St. Louis to Washington, D.C. to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

9,851 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Alaska Airlines

8.0

Very good

9,851 reviews

Alaska Airlines

8.0

Very good

9,851 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Southwest

8.0

Very good

4,279 reviews

Alaska Airlines

8.0

Very good

9,851 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Delta

8.0

Very good

7,910 reviews

Alaska Airlines

8.0

Very good

9,851 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

United Airlines

7.4

Good

8,636 reviews

Alaska Airlines

8.0

Very good

9,851 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

American Airlines

7.2

Good

10,000 reviews

Alaska Airlines

8.0

Very good

9,851 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

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 11 flights from Lambert-St Louis to Washington, D.C. per day from 5 different airlines.
How popular is this St. Louis to Washington, D.C. flight route?
This flight path from Lambert-St Louis to Washington, D.C. was viewed by 9 users in the past month. Keep an eye out for changes in search interest prior to high and low season.
What are the cheapest airlines flying from St. Louis to Washington, D.C. round-trip?
Flying on Frontier is currently your cheapest option to Washington, D.C., with prices starting at $198. Additional round-trip tickets that might be worth considering are offered by American Airlines and Southwest, with the lowest prices starting at $213 and $214, respectively. Frontier is 33% 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 Frontier. According to our data, you can fly for as low as $96. Users have also found prices from $99 and $100 on Southwest 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 - Baltimore/Washington or Lambert-St Louis - Washington, D.C. Reagan-National.
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 $284, our data shows the cheapest flight currently is $88. When looking at the most popular route, (Lambert-St Louis - Washington, D.C. Dulles Intl), you can expect to pay $217 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 $241). Flying from St. Louis to Washington, D.C. 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.

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

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$108	Average$190	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$129	Average$321	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$176	Average$309	FlexibilityNo cancel fee	On-timeN/A
Southwest	Cheapest$191	Average$341	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$211	Average$379	FlexibilityNo cancel fee	On-time69%

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$96+ 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 5/17. 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 November or August, booked 63 days in advance, depart on a Friday or Thursday and return on a Wednesday

Cheap flight deals 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 April 11, 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 April 11, 2025.

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Compare providers for flights from St. Louis to Washington, D.C.

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Washington, D.C. in April.

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

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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 April 4, 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 April 11, 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 March 30, 2025.

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

Rainfall in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average rainfall totals by month.

Temperature in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average temperature totals by month.

Reviews of airlines servicing Washington, D.C.

Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from St. Louis to Washington, D.C. to help guide your decision. 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 Washington, D.C.. 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 Washington, D.C.?

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

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 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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Alternative routes for 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 April 11, 2025.