Need help booking?
Unpublished phone-only deals available
USM to BFI: distance & flight time
Ko Samui (Samui Airport) → Seattle (Boeing Field King County International Airport)
7,717 mi
12,420 km · 6,706 nm
15h 36m
estimated nonstop flight time
-14h
time difference · heading northeast
See live USM→BFI fares Phone-only fares on this route — call free
Flight time details
7,717 miles nonstop takes roughly 15h 36m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 14-hour time set-back when reading arrival times on your ticket.
The two airports
- USM — Samui Airport · Ko Samui, Thailand
- 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 USM
- URT · Surat Thani Airport69 mi away
- NST · Nakhon Si Thammarat Airport70 mi away
- CJM · Chumphon Airport93 mi away
- UNN · Ranong Airport102 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 USM from BFI?
The flight distance from Ko Samui (USM) to Seattle (BFI) 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 USM to BFI?
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 Ko Samui and Seattle?
Seattle is 14 hours behind Ko Samui.
What is the cheapest way to fly from USM to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on USM–BFI that never appear on search engines, with no booking fees.