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

Return flights

25 May - 31 May	Hainan Airlines
13 May - 21 May	Hainan Airlines
25 May - 02 Jun	Hainan Airlines
13 May - 20 May	Air China
25 May - 01 Jun	Air China
16 May - 04 Jun	Air China
31 May - 07 Jun	Air China
18 May - 08 Jun	Air China
19 May - 09 Jun	Air China
19 May - 26 May	Air China
19 May - 27 May	Air China
03 May - 11 May	China Eastern
17 May - 07 Jun	Air China
26 May - 03 Jun	Air China
19 May - 02 Jun	Air India
31 May - 08 Jun	Air China
13 May - 18 May	Air China
20 May - 25 May	Air China
13 May - 19 May	Air China
09 May - 16 May	Air China

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 $520

Return flights