WashingtonSeattleDirect FlightsIAD–BFI
Washington (Washington Dulles International Airport) to Seattle (Boeing Field/King County International Airport).
Flight time from IAD to BFI is estimated at about 5h 20m, based on the 2,299-mile great-circle distance. Our current captured departure sample includes Scheduled across 3 captured airlines, with Alaska Airlines appearing most often in that sample.
Plan this routeAt a glance
| Est. flight time | Distance | Captured freq. | Type |
|---|---|---|---|
| ~5h 20m Estimated from great-circle distance — no tracked flights yet. | 2,299 mi | Scheduled From the current provider sample; confirm live timetables before booking. | Domestic |
Airlines on this route
Captured airlines for IAD to BFI
Our current provider sample includes Scheduled from IAD to BFI across 3 captured airlines.
| Airline | Captured daily freq. | Aircraft | Departures (local) |
|---|---|---|---|
| Alaska Airlines | Scheduled | Varies by schedule | — |
| Delta Air Lines | Scheduled | Varies by schedule | — |
| United Airlines | Scheduled | Varies by schedule | — |
Typical aircraft
Methodology: airline, aircraft, terminal, and departure-time details come from the rolling scheduled-departures window for IAD to BFI, last seen June 15, 2026. Frequency uses 0 scheduled departures across 1 observed day; flight time is estimated from great-circle distance until this route has enough tracked flights for an observed average. Provider coverage can miss operators on some routes, so confirm live timetables before booking.
Route FAQ
How long is the flight from IAD to BFI?
The IAD to BFI flight time is estimated at about 5h 20m from great-circle distance until enough tracked flights are available.
How far is IAD from BFI?
IAD to BFI is about 2,299 miles by air.
Which airlines fly from IAD to BFI?
Our current provider sample for IAD to BFI includes Alaska Airlines, Delta Air Lines, United Airlines. Confirm live timetables before booking.