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

Return flights

28 Apr - 15 May	KLM
30 Apr - 15 May	KLM
22 Apr - 10 May	SWISS
07 Apr - 27 May	KLM
28 Apr - 14 May	KLM
13 Apr - 25 May	KLM
28 Apr - 12 May	KLM
15 Apr - 20 May	KLM
10 Apr - 10 May	SWISS
13 Apr - 26 Apr	SWISS
10 Apr - 26 Apr	SWISS
08 Apr - 15 Apr	SWISS
13 Apr - 19 Apr	SWISS
28 Apr - 06 May	KLM
10 Apr - 19 Apr	SWISS
03 Apr - 26 Apr	SWISS
01 Apr - 19 Apr	SWISS
01 Apr - 08 Apr	SWISS
06 Apr - 13 Apr	ITA Airways
11 Apr - 26 Apr	SWISS

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 $853

Return flights