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SEA to USM: distance & flight time
Seattle (Seattle Tacoma International Airport) → Ko Samui (Samui Airport)
7,721 mi
12,426 km · 6,709 nm
15h 36m
estimated nonstop flight time
+14h
time difference · heading northwest
See live SEA→USM fares Phone-only fares on this route — call free
Flight time details
7,721 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
- SEA — Seattle Tacoma 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 SEA
- RNT · Renton Municipal Airport5 mi away
- BFI · Boeing Field King County International Airport6 mi away
- TIW · Tacoma Narrows Airport18 mi away
- PWT · Bremerton National Airport21 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 SEA from USM?
The flight distance from Seattle (SEA) to Ko Samui (USM) is 7,721 miles (12,426 km, 6,709 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SEA 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 SEA to USM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SEA–USM that never appear on search engines, with no booking fees.