Direct (nonstop) flights from Dulles to Denver
2 airlines fly nonstop from Washington Dulles International (IAD) to Denver International (DEN). It's 1,453 miles (2,338 km), about 3h 58m in the air. Operated by United Airlines, Southwest Airlines.
United Airlines
Southwest Airlines
Route data last updated: May 26, 2026
Airlines with non-stop flights
UA
United Airlines
WN
Southwest Airlines
Alternative Routes
Other ways to fly from Dulles to Denver with one stop · direct emits 245 kg CO₂ per passenger
Looking for the return flight?
DEN → IAD: Flights from Denver to DullesOther direct flights from Dulles
Direct flights from Denver (DEN)
Frequently Asked Questions
How long is the direct flight from Dulles to Denver?
A nonstop flight from Dulles (IAD) to Denver (DEN) takes approximately 3 hours and 58 minutes. The distance is 1,453 miles (2,338 km).
Which airlines fly nonstop from Dulles to Denver?
2 airlines: United Airlines, Southwest Airlines.
Is there a nonstop flight from Dulles to Denver?
Yes. 2 airlines: United Airlines, Southwest Airlines.
How far is Dulles from Denver?
The flight distance from Dulles to Denver is 1,453 miles (2,338 km), measured as the great-circle (shortest air) distance. That's roughly the same distance as New York to Miami.
What type of aircraft flies from Dulles to Denver?
At 3h 58m, this route typically uses narrow-body or mid-range jets — Boeing 737 MAX or Airbus A320neo. Varies by airline.
What is the carbon footprint of a flight from Dulles to Denver?
Roughly 245 kg CO2 per passenger one-way. That's about the same as driving 1,225 km.
Is the return flight from Denver to Dulles also nonstop?
Yes — nonstop flights run both ways. Flight time may differ slightly due to wind patterns.
When is the cheapest time to fly from Dulles to Denver?
Midweek flights (Tue/Wed) outside holiday peaks are usually cheapest. 3-6 weeks ahead is a good window for this route. Use "Check Prices" above to compare.
How early should I arrive at Washington Dulles International for this flight?
1.5-2 hours for domestic. Add more time during holidays or busy travel weekends.