Flights from London to Koh Samui

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
Best option
London
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
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
London
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
Koh Samui
Outbound
27/04/26
2 Stopovers (ZRH, BKK)
LX0333, LX0180, LX4170
17h 00min
Return
26/05/26
2 Stopovers (BKK, ZRH)
LX4179, LX0181, LX0340
18h 30min
Swiss International Air Lines ?
£624
London
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
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
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
London
Koh Samui
Outbound
25/10/26
2 Stopovers (MCT, BKK)
WY0104, WY0817, PG0191
29h 00min
Return
08/11/26
2 Stopovers (BKK, MCT)
PG0124, WY0816, WY0103
26h 55min
Oman Air, Bangkok Airways
£712
London
Koh Samui
Outbound
25/10/26
2 Stopovers (AMS, SIN)
KL1012, KL0835, KL3723
21h 00min
Return
08/11/26
2 Stopovers (BKK, CDG)
PG0102, AF0199, AF1380
21h 25min
KLM
£746
London
Koh Samui
Outbound
25/10/26
2 Stopovers (AMS, SIN)
KL1012, KL0835, KL3723
21h 00min
Return
08/11/26
2 Stopovers (BKK, CDG)
PG0102, AF0199, AF1380
21h 25min
KLM
£747
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 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
The most popular flights on this route are via Abu Dhabi and Bangkok and are booked by 36 % of all travellers.
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 - Koh Samui

Outbound and return from £ 621,35
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