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

Return flights

29 Apr - 20 May	SWISS
21 Apr - 20 May	SWISS
26 Apr - 13 May	KLM
21 Apr - 19 May	SWISS
13 Apr - 11 May	KLM
28 Apr - 14 May	KLM
27 Apr - 11 May	KLM
29 Apr - 13 May	KLM
28 Apr - 11 May	KLM
28 Apr - 13 May	KLM
01 Apr - 20 Apr	KLM
22 Apr - 30 Apr	SWISS
22 Apr - 28 Apr	SWISS
20 Apr - 27 Apr	SWISS
21 Apr - 26 Apr	SWISS
22 Apr - 29 Apr	SWISS
01 Apr - 30 Apr	SWISS
07 Apr - 28 Apr	SWISS
13 Apr - 23 Apr	KLM
13 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 568€

Return flights