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TRS to USM: distance & flight time
Ronchi De Legionari (Trieste–Friuli Venezia Giulia Airport) → Ko Samui (Samui Airport)
5,583 mi
8,985 km · 4,851 nm
11h 25m
estimated nonstop flight time
+5h
time difference · heading east
See live TRS→USM fares Phone-only fares on this route — call free
Flight time details
5,583 miles nonstop takes roughly 11h 25m 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
- TRS — Trieste–Friuli Venezia Giulia Airport · Ronchi De Legionari, 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 TRS
- POW · Portoroz Airport25 mi away
- AVB · Aviano Air Base44 mi away
- LJU · Ljubljana Jože Pučnik Airport55 mi away
- VCE · Venice Marco Polo Airport58 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 TRS from USM?
The flight distance from Ronchi De Legionari (TRS) to Ko Samui (USM) is 5,583 miles (8,985 km, 4,851 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from TRS to USM?
A nonstop flight takes about 11h 25m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
Are there nonstop flights from TRS to USM?
Nonstop service on TRS–USM depends on the season and the day of week. Run the fare search on this page with the nonstop filter applied to see current direct options; when there is no nonstop, a single connection through a carrier hub adds roughly 2–4 hours to the 11h 25m nonstop estimate.
What is the time difference between Ronchi De Legionari and Ko Samui?
Ko Samui is 5 hours ahead of Ronchi De Legionari.
What is the cheapest way to fly from TRS to USM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on TRS–USM that never appear on search engines, with no booking fees.
Why are some TRS to USM fares phone-only?
Consolidator contracts let us sell certain TRS–USM tickets below the price airlines permit us to publish online, so those fares can only be quoted over the phone. Call the travel desk and an agent will check phone-only inventory for your dates.