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SJY to BFI: distance & flight time
Seinäjoki / Ilmajoki (Seinäjoki Airport) → Seattle (Boeing Field King County International Airport)
4,584 mi
7,377 km · 3,983 nm
9h 27m
estimated nonstop flight time
-10h
time difference · heading northwest
See live SJY→BFI fares Phone-only fares on this route — call free
Flight time details
4,584 miles nonstop takes roughly 9h 27m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 10-hour time set-back when reading arrival times on your ticket.
The two airports
- SJY — Seinäjoki Airport · Seinäjoki / Ilmajoki, Finland
- 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 SJY
- KHJ · Kauhajoki Airport21 mi away
- KAU · Kauhava Airport31 mi away
- VAA · Vaasa Airport42 mi away
- KOK · Kokkola-Pietarsaari Airport72 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 SJY from BFI?
The flight distance from Seinäjoki / Ilmajoki (SJY) to Seattle (BFI) is 4,584 miles (7,377 km, 3,983 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SJY to BFI?
A nonstop flight takes about 9h 27m 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 Seinäjoki / Ilmajoki and Seattle?
Seattle is 10 hours behind Seinäjoki / Ilmajoki.
What is the cheapest way to fly from SJY to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SJY–BFI that never appear on search engines, with no booking fees.