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

Return flights

13 May - 24 May	SWISS
09 May - 09 Jun	SWISS
05 May - 01 Jun	ITA Airways
06 May - 17 May	SWISS
05 May - 25 May	ITA Airways
08 May - 24 May	SWISS
03 May - 19 May	KLM
05 May - 19 May	KLM
21 May - 30 May	KLM
04 May - 11 May	KLM
16 May - 30 May	KLM
11 May - 25 May	KLM
29 May - 12 Jun	KLM
25 May - 08 Jun	KLM
18 May - 15 Jun	KLM
28 May - 08 Jun	KLM
28 May - 09 Jun	KLM
26 May - 18 Jun	KLM
27 May - 18 Jun	KLM
27 May - 19 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 $702

Return flights