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

Return flights

14 May - 23 May	Hainan Airlines
25 May - 29 May	Vietnam Airlines
18 May - 27 May	KLM
18 May - 31 May	KLM
21 May - 31 May	KLM
19 May - 27 May	KLM
21 May - 03 Jun	KLM
27 May - 07 Jun	Vietnam Airlines
20 May - 03 Jun	KLM
21 May - 04 Jun	KLM
18 May - 28 May	KLM
18 May - 04 Jun	KLM
10 May - 24 May	Hainan Airlines
20 May - 27 May	KLM
20 May - 28 May	KLM
23 May - 04 Jun	Vietnam Airlines
16 May - 01 Jun	Vietnam Airlines
19 May - 20 Jun	Hainan Airlines
27 May - 06 Jun	KLM
27 May - 02 Jun	KLM

Also check the deals for one-way flights from Bangkok to London 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 Bangkok to London in May from $622

Return flights