Need help booking?
Unpublished phone-only deals available
GTF to USM: distance & flight time
Great Falls (Great Falls International Airport) → Ko Samui (Samui Airport)
8,050 mi
12,956 km · 6,995 nm
16h 15m
estimated nonstop flight time
+13h
time difference · heading northwest
See live GTF→USM fares Phone-only fares on this route — call free
Flight time details
8,050 miles nonstop takes roughly 16h 15m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 13-hour time gain when reading arrival times on your ticket.
The two airports
- GTF — Great Falls International Airport · Great Falls, 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 GTF
- HLN · Helena Regional Airport67 mi away
- CTB · Cut Bank International Airport91 mi away
- LWT · Lewistown Municipal Airport94 mi away
- HVR · Havre City County Airport104 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 GTF from USM?
The flight distance from Great Falls (GTF) to Ko Samui (USM) is 8,050 miles (12,956 km, 6,995 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GTF to USM?
A nonstop flight takes about 16h 15m 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 Great Falls and Ko Samui?
Ko Samui is 13 hours ahead of Great Falls.
What is the cheapest way to fly from GTF to USM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GTF–USM that never appear on search engines, with no booking fees.