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SAY to USM: distance & flight time
Siena (Siena-Ampugnano Airport) → Ko Samui (Samui Airport)
5,708 mi
9,186 km · 4,960 nm
11h 40m
estimated nonstop flight time
+5h
time difference · heading east
See live SAY→USM fares Phone-only fares on this route — call free
Flight time details
5,708 miles nonstop takes roughly 11h 40m 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
- SAY — Siena-Ampugnano Airport · Siena, Italy
- 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 SAY
- GRS · Grosseto Air Base36 mi away
- FLR · Peretola Airport38 mi away
- PSA · Pisa International Airport52 mi away
- EBA · Marina Di Campo Airport62 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 SAY from USM?
The flight distance from Siena (SAY) to Ko Samui (USM) is 5,708 miles (9,186 km, 4,960 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SAY to USM?
A nonstop flight takes about 11h 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 Siena and Ko Samui?
Ko Samui is 5 hours ahead of Siena.
What is the cheapest way to fly from SAY to USM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SAY–USM that never appear on search engines, with no booking fees.