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SIR to USM: distance & flight time
Sion (Sion Airport) → Ko Samui (Samui Airport)
5,873 mi
9,451 km · 5,103 nm
11h 59m
estimated nonstop flight time
+5h
time difference · heading east
See live SIR→USM fares Phone-only fares on this route — call free
Flight time details
5,873 miles nonstop takes roughly 11h 59m gate to gate, flying east. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 5-hour time gain when reading arrival times on your ticket.
The two airports
- SIR — Sion Airport · Sion, Switzerland
- 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 SIR
- AOT · Aosta Airport33 mi away
- QLS · Lausanne-Blécherette Airport41 mi away
- ZIN · Interlaken Air Base41 mi away
- MVV · Megève Airport43 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 SIR from USM?
The flight distance from Sion (SIR) to Ko Samui (USM) is 5,873 miles (9,451 km, 5,103 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SIR to USM?
A nonstop flight takes about 11h 59m 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 Sion and Ko Samui?
Ko Samui is 5 hours ahead of Sion.
What is the cheapest way to fly from SIR to USM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SIR–USM that never appear on search engines, with no booking fees.