Flights from London to Koh Samui with Finnair

Our cheapest offers for flights from London to Koh Samui

Here you can compare cheap flights from London (LON) 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
London
Koh Samui
Outbound
08/12/25
2 Stopovers (HEL, BKK)
AY1340, AY0141, AY6923
18h 50min
Return
24/12/25
2 Stopovers (BKK, HEL)
AY6922, AY0144, AY1331
30h 50min
Finnair
£940
Prices based on recent searches, subject to last-minute changes
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Important flight information

Flight information: London - Koh Samui

Outbound and return from £ 749,30
Distance 9886 km
Departure airport Airport London (LCY, LGW, LHR, LTN, STN, SEN) (LON)
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