Flights from London Heathrow to Koh Samui

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
London Heathrow
Koh Samui
Outbound
08/12/25
2 Stopovers (MCT, BKK)
WY0104, WY0817, PG0191
29h 00min
Return
24/12/25
2 Stopovers (BKK, MCT)
PG0102, WY0816, WY0101
42h 25min
Oman Air, Bangkok Airways
£750
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
2 Stopovers (ZRH, SIN)
LX0345, LX0176, LX4171
32h 05min
Return
24/12/25
2 Stopovers (BKK, VIE)
OS8656, OS0008, OS0335
24h 45min
Swiss International Air Lines
£750
London Heathrow
Koh Samui
Outbound
08/12/25
2 Stopovers (MUC, BKK)
LH2477, LH0772, LH4632
20h 45min
Return
24/12/25
2 Stopovers (BKK, MUC)
LH4643, LH0773, LH2476
26h 30min
Lufthansa
£762
London Heathrow
Koh Samui
Outbound
08/12/25
2 Stopovers (MUC, BKK)
LH2477, LH0772, LH4632
20h 45min
Return
24/12/25
2 Stopovers (BKK, MUC)
LH4623, LH0773, LH2472
20h 55min
Lufthansa
£786
London Heathrow
Koh Samui
Outbound
06/12/25
2 Stopovers (VIE, BKK)
OS0338, OS0007, OS8671
17h 25min
Return
25/12/25
2 Stopovers (BKK, VIE)
OS8670, OS0006, OS0339
18h 40min
Austrian Airlines ?
£831
London Heathrow
Koh Samui
Outbound
08/12/25
2 Stopovers (MUC, BKK)
LH2477, LH0772, LH4632
20h 45min
Return
24/12/25
2 Stopovers (BKK, VIE)
OS8652, OS0008, OS0335
24h 35min
Lufthansa ?
£837
London Heathrow
Koh Samui
Outbound
08/12/25
2 Stopovers (ZRH, SIN)
LX0345, LX0176, LX4171
32h 05min
Return
24/12/25
2 Stopovers (BKK, VIE)
OS8652, OS0008, OS0335
24h 35min
Swiss International Air Lines ?
£848
London Heathrow
Koh Samui
Outbound
09/12/25
2 Stopovers (ZRH, BKK)
LX0333, LX0180, LX4174
18h 05min
Return
24/12/25
2 Stopovers (BKK, ZRH)
LX4179, LX0181, LX0340
19h 20min
Swiss International Air Lines ?
£870
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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Tips and tricks to help you find cheap flights from London Heathrow to Koh Samui

Favourite airline: Etihad Airways
61 % of bookings on this flight route are made with Etihad Airways, EVA Airways and Emirates.
Etihad Airways
29 %
EVA Airways
16 %
Emirates
16 %
Favourite connection: via Abu Dhabi and Bangkok
When booking flights from London Heathrow to Koh Samui 36 % of travellers prefer to fly via Abu Dhabi and Bangkok.
Route
bookings
2 stopovers Abu Dhabi Bangkok Suvarnabhumi
27h 25min, from £ 918
36 %
1 stopover Bangkok Suvarnabhumi
18h 00min, from £ 1.005
26 %
2 stopovers Dubai Bangkok Suvarnabhumi
31h 25min, from £ 1.191
14 %

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