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

Return flights

09 May - 09 Jun	SWISS
05 May - 25 May	ITA Airways
21 May - 23 Jun	KLM
28 May - 23 Jun	KLM
28 May - 08 Jun	KLM
28 May - 09 Jun	KLM
26 May - 18 Jun	KLM
27 May - 19 Jun	KLM
07 May - 11 Jun	KLM
21 May - 01 Jun	KLM
27 May - 18 Jun	KLM
13 May - 20 May	KLM
13 May - 25 May	KLM
04 May - 20 May	KLM
21 May - 28 May	KLM
17 May - 30 May	KLM
04 May - 14 May	KLM
07 May - 19 May	KLM
11 May - 25 May	KLM
10 May - 18 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 $730

Return flights