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FSI to USM: distance & flight time
Fort Sill (Henry Post Army Air Field (Fort Sill)) → Ko Samui (Samui Airport)
9,153 mi
14,730 km · 7,953 nm
18h 25m
estimated nonstop flight time
+12h
time difference · heading northwest
See live FSI→USM fares Phone-only fares on this route — call free
Flight time details
9,153 miles nonstop takes roughly 18h 25m 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
- FSI — Henry Post Army Air Field (Fort Sill) · Fort Sill, 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 FSI
- LAW · Lawton Fort Sill Regional Airport6 mi away
- DUC · Halliburton Field28 mi away
- HBR · Hobart Regional Airport44 mi away
- SPS · Sheppard Air Force Base-Wichita Falls Municipal Airport46 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 FSI from USM?
The flight distance from Fort Sill (FSI) to Ko Samui (USM) is 9,153 miles (14,730 km, 7,953 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from FSI to USM?
A nonstop flight takes about 18h 25m 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 Fort Sill and Ko Samui?
Ko Samui is 12 hours ahead of Fort Sill.
What is the cheapest way to fly from FSI to USM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on FSI–USM that never appear on search engines, with no booking fees.