Great-circle route IAD → SEA. Faint dots are other airports, for geographic context. Download this map — free to reuse with a link back to this page.
The flight time from Washington to Seattle is approximately 5h 01m nonstop. The distance is 2,300 miles (3,701 km). There are about 9 nonstop flights from Washington to Seattle per day.
That is a great-circle estimate, not a scheduled block time. An airline's published time will differ by roughly 15 to 45 minutes depending on routing, winds and taxi.
| Route | Est. time | Distance | Frequency | Airlines |
|---|---|---|---|---|
| IAD → SEA Washington Dulles International Airport to Seattle Tacoma International Airport |
5h 01m | 2,300 mi | 43/wk | Alaska Airlines, Delta Air Lines, United Airlines |
| DCA → SEA Ronald Reagan Washington National Airport to Seattle Tacoma International Airport |
5h 04m | 2,323 mi | 21/wk | Alaska Airlines, Delta Air Lines |
Frequencies come from our most recent schedule sample. Where a pairing shows “—” we track it as an operating nonstop but hold no schedule sample for it — we would rather show nothing than guess.
3 airlines fly nonstop from Washington to Seattle, including Alaska Airlines, Delta Air Lines, United Airlines.
Recent scheduled departures on this route have used the Boeing 737-900, Boeing 737, Airbus A220-300, Boeing 737-800 and 1 other types.
Aircraft assignments change by season and by time of day.
On a long east–west route like this one the two directions do not take the same time. Aircraft flying eastbound ride the mid-latitude jet stream and typically arrive earlier than the westbound leg, which flies into it. The difference is commonly 30 to 90 minutes on transatlantic and transpacific flights, and it varies by season. The estimate above does not model wind — treat it as a midpoint and check the airline's own timetable for the block time on your date.
The distance from Washington to Seattle is 2,300 miles, or 3,701 kilometres.
| Great-circle distance | 2,300 mi |
| Kilometres | 3,701 km |
| Nautical miles | 1,999 nmi |
Measured airport to airport. The actual track is longer — aircraft follow airways, avoid restricted airspace and route around weather.
Yes. 3 airlines fly it nonstop, with about 64 departures a week, across 2 airport pairings. The route is in our live nonstop dataset, last seeded 2026-07-07.
About 5h 01m in the air on the IAD–SEA nonstop. That is a great-circle estimate from the 2,300-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.
2,300 miles (3,701 km) great-circle between Washington Dulles International Airport and Seattle Tacoma International Airport.
Alaska Airlines, Delta Air Lines, United Airlines.
Recent scheduled departures have used the Boeing 737-900, Boeing 737, Airbus A220-300, Boeing 737-800. Assignments change by season and by time of day.
IAD to SEA, DCA to SEA. Flight times differ slightly between them because the airports are not in the same place.
