$65 Cheap Flights from Washington (DCA) to St. Louis (STL)

View $65 flight on Mon, Sep 8, 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at $65 for one-way flights and $130 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Wed, Aug 6 - Sat, Aug 9
DCA
Washington
STL
St. Louis
$130 Roundtrip, found 3 hours ago
$130
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Wed, Aug 6 from Washington to St. Louis, returning Sat, Aug 9, priced at $130 found 3 hours ago
Southwest Airlines
Sun, Aug 31 - Mon, Sep 1
DCA
Washington
STL
St. Louis
$133 Roundtrip, found 9 hours ago
$133
Roundtrip
found 9 hours ago
Select Southwest Airlines flight, departing Sun, Aug 31 from Washington to St. Louis, returning Mon, Sep 1, priced at $133 found 9 hours ago
Southwest Airlines
Wed, Aug 6 - Sat, Aug 9
DCA
Washington
STL
St. Louis
$140 Roundtrip, found 3 hours ago
$140
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Wed, Aug 6 from Washington to St. Louis, returning Sat, Aug 9, priced at $140 found 3 hours ago
Southwest Airlines
Wed, Aug 6 - Sat, Aug 9
DCA
Washington
STL
St. Louis
$145 Roundtrip, found 3 hours ago
$145
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Wed, Aug 6 from Washington to St. Louis, returning Sat, Aug 9, priced at $145 found 3 hours ago
Southwest Airlines
Wed, Aug 6 - Sat, Aug 9
DCA
Washington
STL
St. Louis
$150 Roundtrip, found 3 hours ago
$150
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Wed, Aug 6 from Washington to St. Louis, returning Sat, Aug 9, priced at $150 found 3 hours ago
Southwest Airlines
Fri, Sep 26 - Mon, Sep 29
DCA
Washington
STL
St. Louis
$150 Roundtrip, found 1 hour ago
$150
Roundtrip
found 1 hour ago
Select Southwest Airlines flight, departing Fri, Sep 26 from Washington to St. Louis, returning Mon, Sep 29, priced at $150 found 1 hour ago
Delta
Wed, Aug 6 - Sat, Aug 9
DCA
Washington
STL
St. Louis
$174 Roundtrip, found 3 hours ago
$174
Roundtrip
found 3 hours ago
Select Delta flight, departing Wed, Aug 6 from Washington to St. Louis, returning Sat, Aug 9, priced at $174 found 3 hours ago
American Airlines
Sun, Aug 31 - Sun, Sep 7
DCA
Washington
STL
St. Louis
$176 Roundtrip, found 6 hours ago
$176
Roundtrip
found 6 hours ago
Select American Airlines flight, departing Sun, Aug 31 from Washington to St. Louis, returning Sun, Sep 7, priced at $176 found 6 hours ago
United
Thu, Aug 28 - Sun, Aug 31
DCA
Washington
STL
St. Louis
$208 Roundtrip, found 1 day ago
$208
Roundtrip
found 1 day ago
Select United flight, departing Thu, Aug 28 from Washington to St. Louis, returning Sun, Aug 31, priced at $208 found 1 day ago
Frontier Airlines
Tue, Jul 22 - Wed, Aug 6
DCA
Washington
STL
St. Louis
$264 Roundtrip, found 6 hours ago
$264
Roundtrip
found 6 hours ago
Select Frontier Airlines flight, departing Tue, Jul 22 from Washington to St. Louis, returning Wed, Aug 6, priced at $264 found 6 hours ago

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

November is typically the cheapest month to fly

From $130 - $475 per traveler.

Graph displaying average flight prices per month

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $303
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $303
Flights from Washington (DCA) to St. Louis (STL)
Origin airport
Ronald Reagan Washington National
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$130
Distance
716 mi
Average flight time
1 hour 35 mins

Washington to St. Louis Flights

The cheapest times to fly from Washington to St. Louis

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 Washington to St. Louis are during the month of August. You can find some of the cheapest flights from Washington to St. Louis with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Washington to St. Louis: 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 Washington to St. Louis

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 Washington to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $65 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 Washington to St. Louis 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 Washington to St. Louis 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.

 

Frequently asked questions

How much does a flight from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL) cost?
You'll find cheap return flights from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL) starting from $197. Grab a seat and set off on your next adventure. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a American Airlines flight leaving DCA on July 26 2025 and touching down at STL. The price was last updated on July 2 2025 and has not changed since.
What is the cheapest month to fly from DCA to STL?
The cheapest flights from DCA to STL are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL)?
Jump on a direct flight with Southwest Airlines and head straight from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL).
What is the cheapest airline that flies from DCA to STL?
Right now, the cheapest carrier operating one-way flights from DCA to STL is American Airlines. You can jet off on this route from $99. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from DCA on August 20 2025. Prices were last updated on July 2 2025 and have not changed since.
How many flights per day from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL)?
With an average of 5 nonstop flights departing from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL) every day, you'll be off on your next adventure in no time.
What are the most popular departure times for flights from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL)?
The 8 AM departures from DCA to STL are the busiest. Prices can be higher for these popular slots. If you want to save on your fare, pick a less crowded time to fly.
What day of the week has the most flights from DCA to STL?
Jet off on a Friday if you're searching for the biggest selection of flights from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL).
What is the earliest flight from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL)?
The first flight of the day out of Ronald Reagan Washington National Airport (DCA) is at around 8:00AM UTC-5. Hop on this flight and you'll reach Lambert-St. Louis Intl. Airport (STL) at approximately 9:25AM UTC-6. The total flight duration is 2h 25m.
How long does it take to fly from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL)?
The average flight duration from DCA to STL is 2 hours and 36 minutes, covering a total distance of 720 mi.
What airline has the least delays from DCA to STL?
With 82% of journeys generally arriving as scheduled, American Airlines has the best on-time performance for nonstop flights from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL). To monitor your flight status and get notified if anything changes, use the Expedia App.
What is the best time to fly from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL)?
Opt for a flight from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL) that takes off before 3 PM to reduce the likelihood of delays and cancellations. Departures later than this are on average 22% more likely to be canceled.**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 St. Louis from Ronald Reagan Washington National Airport (DCA)?
If you're boarding a direct flight from Ronald Reagan Washington National Airport (DCA) to St. Louis, Lambert-St. Louis Intl. Airport (STL) is the only airport you can touch down at.
Is it cheaper to buy a plane ticket from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Waiting until just before your trip to book a ticket from DCA to STL generally means paying more. Although you may find some last-minute discounts, they're not always guaranteed. Keep your travel plans flexible to boost your chances of snagging a bargain.
Is it cheaper to book a DCA to STL flight and hotel package?
You'll generally save money by booking a DCA to STL flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage it all in one place. After choosing your preferred accommodations and flights, consider other add-ons like car rentals, tours and activities.
Can I cancel or change the date of my flight from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL)?
Typically, you can cancel or modify your DCA to STL flight. However, there may be additional fees, especially if your booking was made more than 24 hours ago. Check your itinerary for the airline's fees and guidelines on flight changes, or if you'd like more information, go to our Customer Service portal.

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