Great-circle route DEN ↔ IAD. Faint dots are other airports, for geographic context. Download this map — free to reuse with a link back to this page.
Frequencies below are per direction, from our most recent schedule sample. The two directions are not identical — that is normal on scheduled routes.
| Direction | Frequency | Days | Airlines |
|---|---|---|---|
| DEN → IAD Denver to Washington |
53/wk | Daily | United Airlines |
| IAD → DEN Washington to Denver |
62/wk | Daily | United Airlines |
Where a direction shows “—” we track it as an operating nonstop but hold no schedule sample for it — we would rather show nothing than guess.
In 2025, airlines reported 1,223,177 passengers on 7,091 flights between DEN and IAD — about 3,353 a day — filling 85% of the 1,446,660 seats flown. United Air Lines Inc. carried the most passengers (79%).
Source: US DOT T-100 segment reports — actual airline-reported traffic, scheduled service only, both directions combined. Cargo and charter flights excluded.
United Airlines is the only airline flying the DEN–IAD nonstop.
Recent scheduled departures on this route have used the Boeing 737-900, Boeing 757-300, Airbus A320, Boeing 737-800.
Aircraft assignments change by season and by time of day.
The distance between Denver International Airport and Washington Dulles International Airport is 1,449 miles, or 2,332 kilometres.
| Great-circle distance | 1,449 mi |
| Kilometres | 2,332 km |
| Nautical miles | 1,259 nmi |
Measured airport to airport. The actual track is longer — aircraft follow airways, avoid restricted airspace and route around weather.
Yes. United Airlines flies the route nonstop, with about 115 departures a week across both directions. The route is in our live nonstop dataset, last seeded 2026-07-07.
About 3h 25m in the air. That is a great-circle estimate from the 1,449-mile distance, not a scheduled block time — an airline's published time will differ by roughly 15 to 45 minutes depending on routing, winds and taxi.
About 53 a week from Denver to Washington and 62 a week from Washington to Denver, from our most recent schedule sample.
United Airlines.
In 2025, airlines reported 1,223,177 passengers on 7,091 scheduled flights between DEN and IAD — about 3,353 a day — filling 85% of the seats flown. Source: US DOT T-100 segment reports, both directions combined.
Recent scheduled departures have used the Boeing 737-900, Boeing 757-300, Airbus A320, Boeing 737-800. Assignments change by season and by time of day.
