Need help booking?
Unpublished phone-only deals available
KUM to BFI: distance & flight time
Yakushima (Yakushima Airport) → Seattle (Boeing Field King County International Airport)
5,411 mi
8,709 km · 4,702 nm
11h 5m
estimated nonstop flight time
-16h
time difference · heading northeast
See live KUM→BFI fares Phone-only fares on this route — call free
Flight time details
5,411 miles nonstop takes roughly 11h 5m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 16-hour time set-back when reading arrival times on your ticket.
The two airports
- KUM — Yakushima Airport · Yakushima, Japan
- 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 KUM
- TNE · New Tanegashima Airport25 mi away
- KOJ · Kagoshima Airport98 mi away
- KMI · Miyazaki Airport113 mi away
- ASJ · Amami Airport147 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 KUM from BFI?
The flight distance from Yakushima (KUM) to Seattle (BFI) is 5,411 miles (8,709 km, 4,702 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from KUM to BFI?
A nonstop flight takes about 11h 5m 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 Yakushima and Seattle?
Seattle is 16 hours behind Yakushima.
What is the cheapest way to fly from KUM to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on KUM–BFI that never appear on search engines, with no booking fees.