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GRS to USM: distance & flight time
Grosseto (Grosseto Air Base) → Ko Samui (Samui Airport)
5,721 mi
9,207 km · 4,971 nm
11h 41m
estimated nonstop flight time
+5h
time difference · heading east
See live GRS→USM fares Phone-only fares on this route — call free
Flight time details
5,721 miles nonstop takes roughly 11h 41m 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
- GRS — Grosseto Air Base · Grosseto, 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 GRS
- SAY · Siena-Ampugnano Airport36 mi away
- EBA · Marina Di Campo Airport42 mi away
- FCO · Leonardo da Vinci–Fiumicino Airport89 mi away
- PSA · Pisa International Airport72 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 GRS from USM?
The flight distance from Grosseto (GRS) to Ko Samui (USM) is 5,721 miles (9,207 km, 4,971 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GRS to USM?
A nonstop flight takes about 11h 41m 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 Grosseto and Ko Samui?
Ko Samui is 5 hours ahead of Grosseto.
What is the cheapest way to fly from GRS to USM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GRS–USM that never appear on search engines, with no booking fees.