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Find low faresSouthwest® flights from Denver to Washington, D.C. (Dulles) from $89
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Low fares from Denver to Washington, D.C. (Dulles)
$
Denver (DEN)to
Washington, D.C. (Dulles) (IAD)
Depart: 03/04/2026
One-way
Basic
From
$89
Seen: 9 hrs ago
Denver (DEN)to
Washington, D.C. (Dulles) (IAD)
Depart: 03/11/2026
One-way
Basic
From
$89
Seen: 14 hrs ago
Denver (DEN)to
Washington, D.C. (Dulles) (IAD)
Depart: 03/07/2026
One-way
Basic
From
$89
Seen: 7 hrs ago
Denver (DEN)to
Washington, D.C. (Dulles) (IAD)
Depart: 03/25/2026
One-way
Basic
From
$109
Seen: 11 hrs ago
Denver (DEN)to
Washington, D.C. (Dulles) (IAD)
Depart: 02/24/2026
One-way
Basic
From
$109
Seen: 12 hrs ago
Denver (DEN)to
Washington, D.C. (Dulles) (IAD)
Depart: 04/01/2026
One-way
Basic
From
$109
Seen: 12 hrs ago
Explore flights from Denver to Washington, D.C. (Dulles)
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Flight Details
Departing from:
Denver International Airport
Arriving at:
Dulles International Airport
Average flight time:
3 hours 16 minutes
Distance:
1452 miles
Route Information
24† Weekly flights
- 2‡ Nonstop flights per day Monday through Friday
- 1‡ Nonstop flight on Saturday
- 1‡ Nonstop flight 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 Denver to Washington, D.C. (Dulles) is 3 hours 16 minutes.
There are 24 weekly flights from Denver to Washington, D.C. (Dulles) on Southwest Airlines.
Yes, Southwest flies nonstop from Denver to Washington, D.C. (Dulles) 2 times per day from Monday through Friday.
Yes, Southwest flies nonstop from Denver to Washington, D.C. (Dulles) once per day on Saturdays and Sundays.
To find the lowest fares by day and time to fly Denver to Washington, D.C. (Dulles) with Southwest, check out our Low Fare Calendar.
You can rent a car at Dulles International Airport book yours with your flight.
Yes! Flights from Denver to Washington, D.C. (Dulles)—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.