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BFI to UBJ: distance & flight time
Seattle (Boeing Field King County International Airport) → Yamaguchi (Yamaguchi Ube Airport)
5,204 mi
8,376 km · 4,522 nm
10h 40m
estimated nonstop flight time
+16h
time difference · heading northwest
See live BFI→UBJ fares Phone-only fares on this route — call free
Flight time details
5,204 miles nonstop takes roughly 10h 40m 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
- UBJ — Yamaguchi Ube Airport · Yamaguchi, 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 UBJ
- KKJ · Kitakyūshū Airport15 mi away
- OIT · Oita Airport41 mi away
- FUK · Fukuoka Airport53 mi away
- IWK · Iwakuni Marine Corps Air Station57 mi away
Frequently asked questions
How far is BFI from UBJ?
The flight distance from Seattle (BFI) to Yamaguchi (UBJ) is 5,204 miles (8,376 km, 4,522 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from BFI to UBJ?
A nonstop flight takes about 10h 40m 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 Yamaguchi?
Yamaguchi is 16 hours ahead of Seattle.
What is the cheapest way to fly from BFI to UBJ?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on BFI–UBJ that never appear on search engines, with no booking fees.