Flights from IAD to DEN

1 airline flies nonstop from Washington Dulles International Airport to Denver International Airport. Washington Dulles International Airport (Washington, D.C.) to Denver International Airport (Denver).

Distance: 1,449 mi
Nonstop flight: Varies
Time difference: −2h
Nonstop airlines: 1

Fares from IAD to DEN

Checking today’s fares with the airlines.

Nonstop flights

Airline	From	To
United Airlines	IAD Washington Dulles International Airport	DEN Denver International Airport

Nonstop service as of October 2026. Airlines change schedules seasonally.

Getting from the airport into Denver

DEN

Denver International Airport

23 miles (37 km) from the city centre. 82.4 million passengers in 2024

How	Route	Time	Cost
Train	RTD A Line to Denver Union Station	about 37m	$10 Airport Day Pass

Before you go

No passport or visa is needed for domestic travel, but a REAL ID-compliant license or another accepted ID is required to fly within the US.

Denver is 2 hours behind Washington, D.C.. Denver uses the US dollar (USD).

Read the Denver guide: when to go, weather, airports and tips

Frequently asked questions

How long is the flight from IAD to DEN?

Nonstop flight times vary by airline and season; flights with a connection take longer.

Which airlines fly nonstop from IAD to DEN?

As of October 2026, United Airlines flies this route nonstop.

How far is DEN from IAD?

About 1,449 miles (2,332 km) between the airports.

What is the time difference?

Denver is 2 hours behind Washington, D.C..

What ID do I need to fly to Denver?

No passport or visa is needed for domestic travel, but a REAL ID-compliant license or another accepted ID is required to fly within the US.

How do I get from Denver International Airport into Denver?

RTD A Line to Denver Union Station, about 37 minutes, $10 Airport Day Pass.

Sources

Information checked in October 2026. Schedules, fares and entry rules change, so confirm with the airline or the official source before you travel.