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SEA to BFI: distance & flight time

Seattle (Seattle Tacoma International Airport) → Seattle (Boeing Field King County International Airport)

6 mi
9 km · 5 nm
29m
estimated nonstop flight time
Same time
time difference · heading north
See live SEA→BFI fares Phone-only fares on this route — call free

Flight time details

6 miles nonstop takes roughly 29m gate to gate, flying north. Add 45–90 minutes per connection if there's no nonstop service. Both airports share the same local time, so schedules read exactly as flown.

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The two airports

Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.

Alternate airports can cut this fare

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Frequently asked questions

How far is SEA from BFI?

The flight distance from Seattle (SEA) to Seattle (BFI) is 6 miles (9 km, 5 nautical miles), measured along the great-circle route airlines actually fly.

How long is the flight from SEA to BFI?

A nonstop flight takes about 29m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.

What is the cheapest way to fly from SEA to BFI?

Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SEA–BFI that never appear on search engines, with no booking fees.
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