Flights from London Heathrow to Koh Samui with Thai Airways

Our cheapest offers for flights from London Heathrow to Koh Samui

Here you can compare cheap flights from London Heathrow (LHR) to Koh Samui (USM) for one-way or return trips. The following offers were searched for and found on idealo during the last few days. Or start your own flight search to Koh Samui. Prices and availability may change at any time.

Outbound Return Airlines Shop Baggage Price
Best option
London Heathrow
Koh Samui
Outbound
08/12/25
1 Stopover (BKK)
TG0917, PG0193
16h 45min
Return
24/12/25
1 Stopover (BKK)
TG5903, TG0916
19h 35min
Thai Airways, Bangkok Airways ?
£890
London Heathrow
Koh Samui
Outbound
08/12/25
1 Stopover (BKK)
TG0917, PG0193
16h 45min
Return
24/12/25
1 Stopover (BKK)
TG5903, TG0916
19h 35min
Thai Airways, Bangkok Airways ?
£892
Prices based on recent searches, subject to last-minute changes
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Important flight information

Flight information: London Heathrow - Koh Samui

Outbound and return from £ 749,30
Distance 9907 km
Departure airport Airport London Heathrow (LHR)
Arrival airport Airport Koh Samui (USM)
Destination country Flights to Thailand
Alternative routes to Thailand
Alternative flights to Koh Samui
Popular destinations for onward travel
Flight destinations with a similar price