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USM to ISN: distance & flight time
Ko Samui (Samui Airport) → Williston (Sloulin Field International Airport)
8,194 mi
13,186 km · 7,120 nm
16h 32m
estimated nonstop flight time
-12h
time difference · heading north
See live USM→ISN fares Phone-only fares on this route — call free
Flight time details
8,194 miles nonstop takes roughly 16h 32m gate to gate, flying north. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 12-hour time set-back when reading arrival times on your ticket.
The two airports
- USM — Samui Airport · Ko Samui, Thailand
- ISN — Sloulin Field International Airport · Williston, 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 ISN
- SDY · Sidney - Richland Regional Airport41 mi away
- YEN · Estevan Airport78 mi away
- OLF · L M Clayton Airport89 mi away
- GDV · Dawson Community Airport90 mi away
Frequently asked questions
How far is USM from ISN?
The flight distance from Ko Samui (USM) to Williston (ISN) is 8,194 miles (13,186 km, 7,120 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from USM to ISN?
A nonstop flight takes about 16h 32m 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 Williston?
Williston is 12 hours behind Ko Samui.
What is the cheapest way to fly from USM to ISN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on USM–ISN that never appear on search engines, with no booking fees.