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USM to RML: distance & flight time
Ko Samui (Samui Airport) → Colombo (Colombo Ratmalana Airport)
1,392 mi
2,241 km · 1,210 nm
3h 30m
estimated nonstop flight time
-1.5h
time difference · heading west
See live USM→RML fares Phone-only fares on this route — call free
Flight time details
1,392 miles nonstop takes roughly 3h 30m gate to gate, flying west. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 1.5-hour time set-back when reading arrival times on your ticket.
The two airports
- USM — Samui Airport · Ko Samui, Thailand
- RML — Colombo Ratmalana Airport · Colombo, Sri Lanka
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 USM
- URT · Surat Thani Airport69 mi away
- NST · Nakhon Si Thammarat Airport70 mi away
- CJM · Chumphon Airport93 mi away
- UNN · Ranong Airport102 mi away
Near RML
- CMB · Bandaranaike International Colombo Airport25 mi away
- KCT · Koggala Airport65 mi away
- HRI · Mattala Rajapaksa International Airport93 mi away
- GIU · Sigiriya Air Force Base97 mi away
Frequently asked questions
How far is USM from RML?
The flight distance from Ko Samui (USM) to Colombo (RML) is 1,392 miles (2,241 km, 1,210 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from USM to RML?
A nonstop flight takes about 3h 30m 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 Ko Samui and Colombo?
Colombo is 1.5 hours behind Ko Samui.
What is the cheapest way to fly from USM to RML?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on USM–RML that never appear on search engines, with no booking fees.