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KSO to USM: distance & flight time
Kastoria (Kastoria National Airport) → Ko Samui (Samui Airport)
5,203 mi
8,374 km · 4,521 nm
10h 40m
estimated nonstop flight time
+4h
time difference · heading east
See live KSO→USM fares Phone-only fares on this route — call free
Flight time details
5,203 miles nonstop takes roughly 10h 40m gate to gate, flying east. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 4-hour time gain when reading arrival times on your ticket.
The two airports
- KSO — Kastoria National Airport · Kastoria, Greece
- 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 KSO
- KZI · Filippos Airport31 mi away
- IOA · Ioannina Airport57 mi away
- OHD · Ohrid St. Paul the Apostle Airport58 mi away
- LRA · Larisa Airport83 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 KSO from USM?
The flight distance from Kastoria (KSO) to Ko Samui (USM) is 5,203 miles (8,374 km, 4,521 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from KSO to USM?
A nonstop flight takes about 10h 40m 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 Kastoria and Ko Samui?
Ko Samui is 4 hours ahead of Kastoria.
What is the cheapest way to fly from KSO to USM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on KSO–USM that never appear on search engines, with no booking fees.