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

Return flights

28 Apr - 20 May	KLM
29 Apr - 28 May	KLM
07 Apr - 21 May	KLM
29 Apr - 12 May	KLM
23 Apr - 04 May	ITA Airways
29 Apr - 23 May	KLM
30 Apr - 30 May	KLM
30 Apr - 20 May	KLM
29 Apr - 11 May	KLM
28 Apr - 17 May	KLM
08 Apr - 30 Apr	SWISS
08 Apr - 23 Apr	KLM
08 Apr - 16 Apr	SWISS
10 Apr - 23 Apr	KLM
13 Apr - 28 Apr	KLM
06 Apr - 28 Apr	KLM
07 Apr - 28 Apr	KLM
01 Apr - 16 Apr	KLM
06 Apr - 27 Apr	KLM
08 Apr - 27 Apr	KLM

Also check the deals for one-way flights from London to Bangkok in April.

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 April from $775

Return flights