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USM to KOS: distance & flight time
Ko Samui (Samui Airport) → Sihanoukville (Sihanoukville International Airport)
253 mi
408 km · 220 nm
1h 8m
estimated nonstop flight time
Same time
time difference · heading east
See live USM→KOS fares Phone-only fares on this route — call free
Flight time details
253 miles nonstop takes roughly 1h 8m gate to gate, flying east. Add 45–90 minutes per connection if there's no nonstop service. Both airports share the same local time, so schedules read exactly as flown.
The two airports
- USM — Samui Airport · Ko Samui, Thailand
- KOS — Sihanoukville International Airport · Sihanoukville, Cambodia
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 KOS
- PQC · Phu Quoc International Airport37 mi away
- PNH · Phnom Penh International Airport106 mi away
- VKG · Rach Gia Airport110 mi away
- KZC · Kampong Chhnang Airport132 mi away
Frequently asked questions
How far is USM from KOS?
The flight distance from Ko Samui (USM) to Sihanoukville (KOS) is 253 miles (408 km, 220 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from USM to KOS?
A nonstop flight takes about 1h 8m 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 cheapest way to fly from USM to KOS?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on USM–KOS that never appear on search engines, with no booking fees.