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LHR to USM: distance & flight time
London (London Heathrow Airport) → Ko Samui (Samui Airport)
6,149 mi
9,896 km · 5,343 nm
12h 31m
estimated nonstop flight time
+6h
time difference · heading east
See live LHR→USM fares Phone-only fares on this route — call free
Flight time details
6,149 miles nonstop takes roughly 12h 31m gate to gate, flying east. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 6-hour time gain when reading arrival times on your ticket.
The two airports
- LHR — London Heathrow Airport · London, United Kingdom
- 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 LHR
- LGW · London Gatwick Airport25 mi away
- NHT · RAF Northolt6 mi away
- HYC · Wycombe Air Park18 mi away
- FAB · Farnborough Airport19 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 LHR from USM?
The flight distance from London (LHR) to Ko Samui (USM) is 6,149 miles (9,896 km, 5,343 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from LHR to USM?
A nonstop flight takes about 12h 31m 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 London and Ko Samui?
Ko Samui is 6 hours ahead of London.
What is the cheapest way to fly from LHR to USM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on LHR–USM that never appear on search engines, with no booking fees.