Need help booking?
Unpublished phone-only deals available
GLS to USM: distance & flight time
Galveston (Scholes International At Galveston Airport) → Ko Samui (Samui Airport)
9,577 mi
15,412 km · 8,322 nm
19h 15m
estimated nonstop flight time
+12h
time difference · heading northwest
See live GLS→USM fares Phone-only fares on this route — call free
Flight time details
9,577 miles nonstop takes roughly 19h 15m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 12-hour time gain when reading arrival times on your ticket.
The two airports
- GLS — Scholes International At Galveston Airport · Galveston, 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 GLS
- IAH · George Bush Intercontinental Houston Airport57 mi away
- EFD · Ellington Airport30 mi away
- HOU · William P Hobby Airport36 mi away
- LJN · Texas Gulf Coast Regional Airport38 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 GLS from USM?
The flight distance from Galveston (GLS) to Ko Samui (USM) is 9,577 miles (15,412 km, 8,322 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GLS to USM?
A nonstop flight takes about 19h 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 Galveston and Ko Samui?
Ko Samui is 12 hours ahead of Galveston.
What is the cheapest way to fly from GLS to USM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GLS–USM that never appear on search engines, with no booking fees.