Great-circle route ORD ↔ 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 |
|---|---|---|---|
| ORD → IAD Chicago to Washington |
48/wk | Daily | United Airlines |
| IAD → ORD Washington to Chicago |
49/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 566,901 passengers on 4,043 flights between ORD and IAD — about 1,554 a day — filling 81% of the 700,096 seats flown. United Air Lines Inc. carried the most passengers (100%).
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 ORD–IAD nonstop.
Recent scheduled departures on this route have used the Boeing 737-900, Boeing 757-200, Airbus A320, Boeing 737 and 2 other types.
Aircraft assignments change by season and by time of day.
The distance between Chicago O'Hare International Airport and Washington Dulles International Airport is 587 miles, or 945 kilometres.
| Great-circle distance | 587 mi |
| Kilometres | 945 km |
| Nautical miles | 510 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 97 departures a week across both directions. The route is in our live nonstop dataset, last seeded 2026-07-07.
About 1h 47m in the air. That is a great-circle estimate from the 587-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 48 a week from Chicago to Washington and 49 a week from Washington to Chicago, from our most recent schedule sample.
United Airlines.
In 2025, airlines reported 566,901 passengers on 4,043 scheduled flights between ORD and IAD — about 1,554 a day — filling 81% of the seats flown. Source: US DOT T-100 segment reports, both directions combined.
Recent scheduled departures have used the Boeing 737-900, Boeing 757-200, Airbus A320, Boeing 737. Assignments change by season and by time of day.
