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

Return flights

05 May - 02 Jun	SWISS
10 May - 20 May	KLM
11 May - 28 May	KLM
04 May - 20 May	KLM
20 May - 28 May	KLM
20 May - 03 Jun	KLM
18 May - 11 Jun	KLM
13 May - 03 Jun	KLM
31 May - 11 Jun	KLM
20 May - 16 Jun	KLM
10 May - 03 Jun	KLM
11 May - 03 Jun	KLM
26 May - 16 Jun	KLM
29 May - 13 Jun	KLM
05 May - 28 May	KLM
07 May - 18 May	KLM
06 May - 19 May	KLM
03 May - 18 May	KLM
19 May - 25 May	KLM
19 May - 28 May	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 635€

Return flights