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Find low faresSouthwest® flights from St. Louis to Washington, D.C. (Reagan National) from $80
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Low fares from St. Louis to Washington, D.C. (Reagan National)
$
St. Louis (STL)to
Washington, D.C. (Reagan National) (DCA)
Depart: 03/07/2026
One-way
Basic
From
$80
Seen: 21 minutes ago
St. Louis (STL)to
Washington, D.C. (Reagan National) (DCA)
Depart: 03/14/2026
One-way
Basic
From
$103
Seen: 2 hrs ago
St. Louis (STL)to
Washington, D.C. (Reagan National) (DCA)
Depart: 03/07/2026
One-way
Choice
From
$108
Seen: 21 minutes ago
St. Louis (STL)to
Washington, D.C. (Reagan National) (DCA)
Depart: 02/25/2026
One-way
Basic
From
$117
Seen: 2 hrs ago
St. Louis (STL)to
Washington, D.C. (Reagan National) (DCA)
Depart: 04/11/2026
One-way
Basic
From
$120
Seen: 8 hrs ago
St. Louis (STL)to
Washington, D.C. (Reagan National) (DCA)
Depart: 04/22/2026
One-way
Basic
From
$129
Seen: 18 hrs ago
Explore flights from St. Louis to Washington, D.C. (Reagan National)
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Flight Details
Departing from:
Lambert-St Louis Int'l Airport
Arriving at:
Ronald Reagan National Airport
Average flight time:
1 hour 59 minutes
Distance:
719 miles
Route Information
142† Weekly flights
- 4‡ Nonstop flights per day Monday through Friday
- 3‡ Nonstop flights on Saturday
- 4‡ Nonstop flights on Sunday
† Weekly flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025. Note: route may not operate every day of the week.
‡ Nonstop flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025.
Questions we hear the most
The average flight time from St. Louis to Washington, D.C. (Reagan National) is 1 hour 59 minutes.
There are 142 weekly flights from St. Louis to Washington, D.C. (Reagan National) on Southwest Airlines.
Yes, Southwest flies nonstop from St. Louis to Washington, D.C. (Reagan National) 4 times per day from Monday through Friday.
Yes, Southwest flies nonstop from St. Louis to Washington, D.C. (Reagan National) 3 times per day on Saturdays and 4 times per day on Sundays.
To find the lowest fares by day and time to fly St. Louis to Washington, D.C. (Reagan National) with Southwest, check out our Low Fare Calendar.
You can rent a car at Ronald Reagan National Airport book yours with your flight.
Yes! Flights from St. Louis to Washington, D.C. (Reagan National)—or from here or there to anywhere—can be changed with no change fees. Fare difference may apply.
Check the status of your upcoming Southwest flight.
Check out the Southwest Airlines® Help Center for answers about everything Southwest.