CA $202 Cheap Flights from Washington (DCA) to St. Louis (STL)

View CA $202 flight on Mon, Apr 13, 2026Opens in a new window

Popular airlines from Ronald Reagan National Airport (DCA) to Lambert-St. Louis International Airport (STL)

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 30% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap flights from Washington (DCA) to St. Louis (STL)

Prices were available within the past 7 days and start at CA $202 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

The Annual Vacation Sale

Members save up to 40% on hotels and homes. Plan this year’s big trip and save.
Book now

Find the cheapest month to fly from Washington (DCA) to St. Louis (STL)

August is typically the cheapest month to fly

From CA $165 - CA $842 per traveller.

Frequently asked questions

How much is a flight from DCA to Lambert Field?
Round-trip tickets between National Airport and Lambert-St. Louis Intl. Airport (STL) start from . This figure is based on fares quoted within the last 7 days on Expedia for flights departing within the next year — book today so you don't miss out. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL)?
Every air carrier has its own set of terms and conditions. If you do decide to cancel, follow the instructions on our Customer Service Portal.
How do I find cheap flights from DCA to Lambert Field that have flexible change policies?
Plenty of carriers offer the option to move your flight without a change fee. All you pay is any additional cost for the new flight. When searching for National Airport to STL flights, you'll see a "No change fees" filter for you to select.
How many hours is the flight from National Airport to Lambert-St. Louis Intl. Airport (STL)?
With the flight time between DCA and Lambert Field just 2 hours and 36 minutes, you'll be exploring St. Louis in the blink of an eye.
How far is the flight from National Airport to Lambert Field?
A flight distance of just 1,150 kilometres separates Arlington and St. Louis. Once you're up in the skies, you won't get a chance to do much more than browse the magazine in your seat-back pocket.
Which airlines fly direct from DCA to Lambert Field?
Southwest Airlines (WN) is one of the top choices for travellers jetting between National Airport and Lambert Field. Select from the 113 flights it operates on this route each month. You could also have a look at the airfares with American Airlines (AA). This airline operates 56 flights every month between Arlington and St. Louis.
Are DCA to Lambert Field flight tickets cheaper when they're purchased at the last minute?
It is possible to get a great last-minute deal from National Airport to Lambert-St. Louis Intl. Airport (STL), but there's no guarantee. As many airlines publish prices up to 12 months in advance, it's worth keeping an eye on fares early and being ready to book when you see a bargain. Expedia compares carrier prices and updates flight deals often, so you can be sure you're always seeing the latest offers.

Travel information

Origin airport
Ronald Reagan Washington National
Destination airport
Lambert-St. Louis Intl.
Distance
1147 km
Average flight time
1 hour 30 mins

Book with confidence

Washington to St. Louis Flights

The easy way to book your flights from Washington to St. Louis 

With Expedia, it’s simple to find and book flights to St. Louis from Washington whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from 20 airlines that cover this route. There are nonstop flights to Lambert-St. Louis Intl., too.  

Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from Washington to St. Louis today, tomorrow, or this week.  

 

Save dollars with cheap flights from Ronald Reagan Washington National, DCA to Lambert-St. Louis Intl., STL 

Sort your search results by price to find great deals on your flight from Washington to St. Louis—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to St. Louis from Washington currently is just rising to .  

Here are more money-saving tips: 

  • Fly in when flight prices are normally at their lowest 
  • Book about a month to 6 weeks before you travel for the best prices to St. Louis  
  • Avoid peak season and weekends when flights can cost more
  • Early morning and late-night flights are sometimes cheaper, so try varying your travel times 
  • One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free! 

 

Reasons to choose Expedia for your flight to St. Louis from Washington 

Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. So book your flight to St. Louis with Expedia today.

Washington to St. Louis Flights

Explore a world of travel with Expedia

*Available to Expedia members.