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SFZ to BFI: distance & flight time
Smithfield (North Central State Airport) → Seattle (Boeing Field King County International Airport)
2,479 mi
3,989 km · 2,154 nm
5h 20m
estimated nonstop flight time
-3h
time difference · heading northwest
See live SFZ→BFI fares Phone-only fares on this route — call free
Flight time details
2,479 miles nonstop takes roughly 5h 20m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 3-hour time set-back when reading arrival times on your ticket.
The two airports
- SFZ — North Central State Airport · Smithfield, United States
- BFI — Boeing Field King County International Airport · Seattle, United States
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near SFZ
- BOS · General Edward Lawrence Logan International Airport39 mi away
- PVD · Theodore Francis Green State Airport14 mi away
- NCO · Quonset State Airport23 mi away
- OWD · Norwood Memorial Airport25 mi away
Near BFI
- SEA · Seattle Tacoma International Airport6 mi away
- RNT · Renton Municipal Airport5 mi away
- PWT · Bremerton National Airport22 mi away
- TIW · Tacoma Narrows Airport22 mi away
Frequently asked questions
How far is SFZ from BFI?
The flight distance from Smithfield (SFZ) to Seattle (BFI) is 2,479 miles (3,989 km, 2,154 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SFZ to BFI?
A nonstop flight takes about 5h 20m 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 time difference between Smithfield and Seattle?
Seattle is 3 hours behind Smithfield.
What is the cheapest way to fly from SFZ to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SFZ–BFI that never appear on search engines, with no booking fees.