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BFI to SYO: distance & flight time
Seattle (Boeing Field King County International Airport) → Shonai (Shonai Airport)
4,633 mi
7,456 km · 4,026 nm
9h 33m
estimated nonstop flight time
+16h
time difference · heading northwest
See live BFI→SYO fares Phone-only fares on this route — call free
Flight time details
4,633 miles nonstop takes roughly 9h 33m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 16-hour time gain when reading arrival times on your ticket.
The two airports
- BFI — Boeing Field King County International Airport · Seattle, United States
- SYO — Shonai Airport · Shonai, Japan
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 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
Near SYO
- GAJ · Yamagata Airport42 mi away
- AXT · Akita Airport60 mi away
- KIJ · Niigata Airport69 mi away
- SDJ · Sendai Airport77 mi away
Frequently asked questions
How far is BFI from SYO?
The flight distance from Seattle (BFI) to Shonai (SYO) is 4,633 miles (7,456 km, 4,026 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from BFI to SYO?
A nonstop flight takes about 9h 33m 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 Seattle and Shonai?
Shonai is 16 hours ahead of Seattle.
What is the cheapest way to fly from BFI to SYO?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on BFI–SYO that never appear on search engines, with no booking fees.