Flights from London Heathrow to Koh Samui

Trip type

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
27/04/26
2 Stopovers (VIE, BKK)
OS0338, OS0007, OS8663
16h 15min
Return
26/05/26
2 Stopovers (BKK, ZRH)
LX4179, LX0181, LX0340
18h 30min
Austrian Airlines ?
£622
London Heathrow
Koh Samui
Outbound
28/04/26
2 Stopovers (ZRH, SIN)
LX0345, LX0176, LX4171
33h 10min
Return
28/05/26
2 Stopovers (BKK, VIE)
OS8674, OS0008, OS0331
18h 50min
Swiss International Air Lines
£626
Best option
London Heathrow
Koh Samui
Outbound
25/05/26
1 Stopover (BKK)
BR0068, BR3909
18h 00min
Return
07/06/26
1 Stopover (BKK)
BR3932, BR0067
16h 05min
EVA Airways ?
£896
London Heathrow
Koh Samui
Outbound
27/04/26
2 Stopovers (MUC, BKK)
LH2479, LH0772, LH4642
17h 00min
Return
31/05/26
2 Stopovers (BKK, VIE)
OS8674, OS0008, OS0331
18h 50min
Lufthansa ?
£622
London Heathrow
Koh Samui
Outbound
27/05/26
2 Stopovers (ZRH, BKK)
LX0333, LX0180, LX4170
16h 55min
Return
09/06/26
2 Stopovers (BKK, ZRH)
LX4179, LX0181, LX0340
18h 30min
Swiss International Air Lines ?
£623
London Heathrow
Koh Samui
Outbound
26/05/26
2 Stopovers (VIE, BKK)
OS0338, OS0007, OS8663
16h 15min
Return
09/06/26
2 Stopovers (BKK, VIE)
OS8674, OS0008, OS0331
17h 45min
Austrian Airlines ?
£637
London Heathrow
Koh Samui
Outbound
28/04/26
2 Stopovers (ZRH, SIN)
LX0327, LX0176, LX4171
20h 30min
Return
28/05/26
2 Stopovers (BKK, VIE)
OS8674, OS0008, OS0331
18h 50min
Swiss International Air Lines
£637
London Heathrow
Koh Samui
Outbound
25/05/26
2 Stopovers (MCT, BKK, DMK)
WY0104, WY0817, PG0453
24h 30min
Return
07/06/26
2 Stopovers (BKK, MCT)
PG0102, WY0816, WY0103
28h 40min
Oman Air, Bangkok Airways
£639
London Heathrow
Koh Samui
Outbound
28/04/26
2 Stopovers (FRA, SIN)
LH0915, LH0780, LH4630
21h 40min
Return
28/05/26
2 Stopovers (BKK, VIE)
OS8674, OS0008, OS0331
18h 50min
Lufthansa
£647
London Heathrow
Koh Samui
Outbound
28/04/26
2 Stopovers (ZRH, SIN)
LX0327, LX0176, LX4171
20h 30min
Return
28/05/26
2 Stopovers (SIN, FRA)
LH4636, LH0781, LH0900
22h 15min
Swiss International Air Lines
£663
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 £ 621,35
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
Flight destinations with a similar price