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

Return flights

21 Apr - 20 May	SWISS
29 Apr - 10 May	SWISS
20 Apr - 17 May	SWISS
27 Apr - 18 May	KLM
13 Apr - 28 Apr	KLM
10 Apr - 10 May	SWISS
01 Apr - 19 May	KLM
19 Apr - 10 May	SWISS
15 Apr - 26 Apr	SWISS
25 Apr - 17 May	SWISS
20 Apr - 26 Apr	SWISS
10 Apr - 26 Apr	SWISS
07 Apr - 28 Apr	SWISS
18 Apr - 17 May	SWISS
25 Apr - 10 May	SWISS
11 Apr - 26 Apr	SWISS
01 Apr - 29 Apr	KLM
13 Apr - 20 Apr	SWISS
10 Apr - 19 Apr	SWISS
19 Apr - 30 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 $727

Return flights