AirHint found the following cheapest return flights from London (LCY) to Bangkok (BKK) in May 2026 (see full year).

Return flights

20 May - 27 May	KLM
20 May - 03 Jun	KLM
06 May - 10 Jun	KLM
04 May - 11 May	ITA Airways
22 May - 03 Jun	KLM
03 May - 27 May	KLM
19 May - 26 May	SWISS
21 May - 27 May	KLM
08 May - 22 May	KLM
18 May - 25 May	ITA Airways
12 May - 20 May	KLM
07 May - 29 May	KLM
15 May - 29 May	KLM
26 May - 09 Jun	KLM
03 May - 01 Jun	KLM
26 May - 16 Jun	KLM
22 May - 02 Jun	KLM
25 May - 09 Jun	KLM
21 May - 02 Jun	KLM
28 May - 22 Jun	KLM

Also check the deals for one-way flights from London to Bangkok in May.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from London to Bangkok in May from $737

Return flights