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BFI to USM: distance & flight time
Seattle (Boeing Field King County International Airport) → Ko Samui (Samui Airport)
7,717 mi
12,420 km · 6,706 nm
15h 36m
estimated nonstop flight time
+14h
time difference · heading northwest
See live BFI→USM fares Phone-only fares on this route — call free
Flight time details
7,717 miles nonstop takes roughly 15h 36m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 14-hour time gain when reading arrival times on your ticket.
The two airports
- BFI — Boeing Field King County International Airport · Seattle, United States
- USM — Samui Airport · Ko Samui, Thailand
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 USM
- URT · Surat Thani Airport69 mi away
- NST · Nakhon Si Thammarat Airport70 mi away
- CJM · Chumphon Airport93 mi away
- UNN · Ranong Airport102 mi away
Frequently asked questions
How far is BFI from USM?
The flight distance from Seattle (BFI) to Ko Samui (USM) is 7,717 miles (12,420 km, 6,706 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from BFI to USM?
A nonstop flight takes about 15h 36m 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 Ko Samui?
Ko Samui is 14 hours ahead of Seattle.
What is the cheapest way to fly from BFI to USM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on BFI–USM that never appear on search engines, with no booking fees.