$96 Cheap Flights from St. Louis (STL) to Washington (DCA)

View $96 flight on Sun, Mar 8, 2026Opens in a new window

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

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Cheap Flights from St. Louis to Washington (STL-DCA)

Prices were available within the past 7 days and start at $96 for one-way flights and $159 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Wed, Nov 5 - Thu, Nov 6
STL
St. Louis
DCA
Washington
$159 Roundtrip, found 4 days ago
$159
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Wed, Nov 5 from St. Louis to Washington, returning Thu, Nov 6, priced at $159 found 4 days ago
American Airlines
Thu, Mar 5 - Sun, Mar 8
STL
St. Louis
DCA
Washington
$161 Roundtrip, found 1 day ago
$161
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Mar 5 from St. Louis to Washington, returning Sun, Mar 8, priced at $161 found 1 day ago
American Airlines
Fri, Nov 7 - Sun, Nov 9
STL
St. Louis
DCA
Washington
$165 Roundtrip, found 1 day ago
$165
Roundtrip
found 1 day ago
Select American Airlines flight, departing Fri, Nov 7 from St. Louis to Washington, returning Sun, Nov 9, priced at $165 found 1 day ago
Delta
Fri, Dec 5 - Sun, Dec 7
STL
St. Louis
DCA
Washington
$168 Roundtrip, found 1 day ago
$168
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Dec 5 from St. Louis to Washington, returning Sun, Dec 7, priced at $168 found 1 day ago
United
Wed, Nov 5 - Thu, Nov 6
STL
St. Louis
DCA
Washington
$176 Roundtrip, found 4 days ago
$176
Roundtrip
found 4 days ago
Select United flight, departing Wed, Nov 5 from St. Louis to Washington, returning Thu, Nov 6, priced at $176 found 4 days ago
Delta
Tue, Oct 21 - Sat, Oct 25
STL
St. Louis
DCA
Washington
$197 Roundtrip, found 1 day ago
$197
Roundtrip
found 1 day ago
Select Delta flight, departing Tue, Oct 21 from St. Louis to Washington, returning Sat, Oct 25, priced at $197 found 1 day ago
American Airlines
Sat, Dec 6 - Sat, Dec 13
STL
St. Louis
DCA
Washington
$201 Roundtrip, found 1 day ago
$201
Roundtrip
found 1 day ago
Select American Airlines flight, departing Sat, Dec 6 from St. Louis to Washington, returning Sat, Dec 13, priced at $201 found 1 day ago
Delta
Fri, Dec 5 - Sun, Dec 7
STL
St. Louis
DCA
Washington
$204 Roundtrip, found 1 day ago
$204
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Dec 5 from St. Louis to Washington, returning Sun, Dec 7, priced at $204 found 1 day ago
United
Wed, Dec 10 - Sun, Dec 14
STL
St. Louis
DCA
Washington
$206 Roundtrip, found 1 day ago
$206
Roundtrip
found 1 day ago
Select United flight, departing Wed, Dec 10 from St. Louis to Washington, returning Sun, Dec 14, priced at $206 found 1 day ago
Frontier Airlines
Wed, Oct 29 - Tue, Nov 4
STL
St. Louis
DCA
Washington
$264 Roundtrip, found 3 hours ago
$264
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Wed, Oct 29 from St. Louis to Washington, returning Tue, Nov 4, priced at $264 found 3 hours ago

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

August is typically the cheapest month to fly

From $117 - $491 per traveler.

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA) cost?
Grab a cheap one-way flight from $96 or cheap return flight from $159 from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA)?
The cheapest month to fly from STL to DCA is November, when there's less demand. Off-peak season is usually when better flight deals are available between these airports.
Which airlines fly direct from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA)?
Take a nonstop flight with Southwest Airlines and journey straight from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA).
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA)?
The cheapest airline to offer flights between Lambert-St. Louis Intl. Airport (STL) and Ronald Reagan Washington National Airport (DCA) will change depending on when you want to travel. American Airlines and Southwest Airlines are just some well-known options offering competitive fares. Use Expedia's search tool to compare airlines in one place and find the right STL to DCA flight that fits your budget.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA)?
Daily, an average of 5 nonstop flights take off from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA). Choose the departure time that best fits your schedule.
What are the most popular departure times for flights from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA)?
Flights between STL and DCA are their busiest at 6 AM. If you're after a more relaxed trip and potentially cheaper fares, look for a time outside the usual busy windows.
What day of the week has the most flights from STL to DCA?
If you travel on a Friday, you'll get the greatest range of options for flights from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA).
What is the earliest flight from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA)?
Take the earliest flight at around 6:00AM UTC-6, departing from Lambert-St. Louis Intl. Airport (STL). You'll be in the air for roughly 2h 20m, arriving at Ronald Reagan Washington National Airport (DCA) at approximately 9:20AM UTC-5.
How long does it take to fly from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA)?
It takes roughly 2 hours and 4 minutes to cover the 720 mi from STL to DCA.
What airline has the least delays from STL to DCA?
With 83% of journeys generally arriving as scheduled, American Airlines has the best on-time performance for nonstop flights from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA). To keep track of your flight status and get notifications about any changes, simply head to the Expedia App.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA)?
To land at Ronald Reagan Washington National Airport (DCA) without delays, opt for a flight that takes off from Lambert-St. Louis Intl. Airport (STL) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Washington from Lambert-St. Louis Intl. Airport (STL)?
Come in for landing at one of these Washington airports following your direct flight from Lambert-St. Louis Intl. Airport (STL):

  • Ronald Reagan Washington National Airport (DCA)
  • Washington Dulles Intl. Airport (IAD)
  • Baltimore Washington Intl. Thurgood Marshall Airport (BWI)

Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA) last-minute?
Waiting until just before your trip to book a flight from STL to DCA often results in higher prices. While you may find some last-minute offers, they aren't always guaranteed. Allow some flexibility in your schedule for the best chance of getting a bargain.
Is it cheaper to book a STL to DCA flight and hotel package?
You'll generally save money by securing a STL to DCA flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one convenient place. Once you've selected your ideal flights and accommodations, consider adding extras including car rentals, tours and activities.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA)?
You can usually reschedule or cancel your STL to DCA flight. However, if it's been more than 24 hours since booking, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Ronald Reagan Washington National
Airlines serving
American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$159
Distance
716 mi
Average flight time
3 hours 3 mins

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Book with confidence

St. Louis to Washington Flights

The cheapest times to fly from St. Louis to Washington

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Washington are during the month of November. You can find some of the cheapest flights from St. Louis to Washington with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Washington

Sunday is one of the best days to book for cheap flights from St. Louis to Washington: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Washington

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Washington in 2025. You can also book with separate airlines for your outbound and return journeys, from $96 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Washington flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Washington airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

St. Louis to Washington Flights

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