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SIR to KOS: distance & flight time
Sion (Sion Airport) → Sihanoukville (Sihanoukville International Airport)
5,989 mi
9,639 km · 5,205 nm
12h 13m
estimated nonstop flight time
+5h
time difference · heading east
See live SIR→KOS fares Phone-only fares on this route — call free
Flight time details
5,989 miles nonstop takes roughly 12h 13m 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
- 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 SIR
- AOT · Aosta Airport33 mi away
- QLS · Lausanne-Blécherette Airport41 mi away
- ZIN · Interlaken Air Base41 mi away
- MVV · Megève Airport43 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 SIR from KOS?
The flight distance from Sion (SIR) to Sihanoukville (KOS) is 5,989 miles (9,639 km, 5,205 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SIR to KOS?
A nonstop flight takes about 12h 13m 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 Sihanoukville?
Sihanoukville is 5 hours ahead of Sion.
What is the cheapest way to fly from SIR to KOS?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SIR–KOS that never appear on search engines, with no booking fees.