$100 Cheap Flights from Washington (DCA) to St. Louis (STL)

View $100 flight on Tue, Jan 13, 2026Opens in a new window

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

Today's featured flight deals from Ronald Reagan Washington National Airport (DCA) to St. Louis Lambert Intl. Airport (STL)

Nonstop
Carry-on included
Lower price than typical

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

Prices were available within the past 7 days and start at $100 for one-way flights and $118 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Sat, Nov 8 - Tue, Nov 11
DCA
Washington
STL
St. Louis
$118 Roundtrip, found 5 hours ago
$118
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Sat, Nov 8 from Washington to St. Louis, returning Tue, Nov 11, priced at $118 found 5 hours ago
American Airlines
Wed, Dec 31 - Thu, Jan 1
DCA
Washington
STL
St. Louis
$185 Roundtrip, found 3 days ago
$185
Roundtrip
found 3 days ago
Select American Airlines flight, departing Wed, Dec 31 from Washington to St. Louis, returning Thu, Jan 1, priced at $185 found 3 days ago
Frontier Airlines
Sat, Oct 18 - Tue, Oct 28
DCA
Washington
STL
St. Louis
$188 Roundtrip, found 2 hours ago
$188
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Sat, Oct 18 from Washington to St. Louis, returning Tue, Oct 28, priced at $188 found 2 hours ago
Frontier Airlines
Sat, Nov 8 - Tue, Nov 18
DCA
Washington
STL
St. Louis
$191 Roundtrip, found 5 hours ago
$191
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Sat, Nov 8 from Washington to St. Louis, returning Tue, Nov 18, priced at $191 found 5 hours ago
American Airlines
Sun, Dec 14 - Thu, Dec 18
DCA
Washington
STL
St. Louis
$199 Roundtrip, found 2 hours ago
$199
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Sun, Dec 14 from Washington to St. Louis, returning Thu, Dec 18, priced at $199 found 2 hours ago
Frontier Airlines
Fri, Oct 17 - Tue, Oct 28
DCA
Washington
STL
St. Louis
$201 Roundtrip, found 2 hours ago
$201
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Fri, Oct 17 from Washington to St. Louis, returning Tue, Oct 28, priced at $201 found 2 hours ago
American Airlines
Thu, Nov 6 - Sun, Nov 9
DCA
Washington
STL
St. Louis
$212 Roundtrip, just found
$212
Roundtrip
just found
Select American Airlines flight, departing Thu, Nov 6 from Washington to St. Louis, returning Sun, Nov 9, priced at $212 just found
Delta
Sun, Nov 2 - Wed, Nov 5
DCA
Washington
STL
St. Louis
$215 Roundtrip, found 3 days ago
$215
Roundtrip
found 3 days ago
Select Delta flight, departing Sun, Nov 2 from Washington to St. Louis, returning Wed, Nov 5, priced at $215 found 3 days ago
United
Fri, Nov 14 - Sat, Nov 15
DCA
Washington
STL
St. Louis
$224 Roundtrip, found 4 days ago
$224
Roundtrip
found 4 days ago
Select United flight, departing Fri, Nov 14 from Washington to St. Louis, returning Sat, Nov 15, priced at $224 found 4 days ago
Southwest Airlines
Fri, Oct 31 - Mon, Nov 3
DCA
Washington
STL
St. Louis
$229 Roundtrip, found 2 days ago
$229
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Fri, Oct 31 from Washington to St. Louis, returning Mon, Nov 3, priced at $229 found 2 days ago

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

August is typically the cheapest month to fly

From $117 - $597 per traveler.

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 $449
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $449

Frequently asked questions

How much does a flight from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL) cost?
Secure a cheap one-way flight from $100 or cheap return flight from $118 from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL)?
The cheapest month to fly from DCA to STL is November, when demand is low. Off-peak months are typically when airlines offer lower prices between these airports.
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 Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis Intl. Airport (STL)?
The cheapest airline to offer flights between Ronald Reagan Washington National Airport (DCA) and Lambert-St. Louis Intl. Airport (STL) will change depending on your travel dates. American Airlines and Southwest Airlines are just some of your options offering well-priced fares. Use Expedia's search tool to compare airlines in one place and find the right DCA to STL flight for your budget.
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.

Travel information

Travel information

Origin airport
Ronald Reagan Washington National
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$118
Distance
716 mi
Average flight time
1 hour 22 mins

Book with confidence

Book with confidence

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 November. 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 $100 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.

 

Washington to St. Louis Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia

*Available to One Key members.