Great-circle route IAH ↔ 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 |
|---|---|---|---|
| IAH → IAD Houston to Washington |
36/wk | Daily | United Airlines |
| IAD → IAH Washington to Houston |
35/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 535,762 passengers on 3,921 flights between IAH and IAD — about 1,469 a day — filling 83% of the 647,813 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 IAH–IAD nonstop.
Recent scheduled departures on this route have used the Boeing 737-900, Boeing 737-700, Boeing 737-800, Boeing 737 and 1 other types.
Aircraft assignments change by season and by time of day.
The distance between George Bush Intercontinental Houston Airport and Washington Dulles International Airport is 1,189 miles, or 1,914 kilometres.
| Great-circle distance | 1,189 mi |
| Kilometres | 1,914 km |
| Nautical miles | 1,033 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 71 departures a week across both directions. The route is in our live nonstop dataset, last seeded 2026-07-07.
About 2h 55m in the air. That is a great-circle estimate from the 1,189-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 36 a week from Houston to Washington and 35 a week from Washington to Houston, from our most recent schedule sample.
United Airlines.
In 2025, airlines reported 535,762 passengers on 3,921 scheduled flights between IAH and IAD — about 1,469 a day — filling 83% of the seats flown. Source: US DOT T-100 segment reports, both directions combined.
Recent scheduled departures have used the Boeing 737-900, Boeing 737-700, Boeing 737-800, Boeing 737. Assignments change by season and by time of day.
