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

Return flights

29 Aug - 20 Sep	SWISS
29 Aug - 13 Sep	SWISS
31 Aug - 13 Sep	SWISS
28 Aug - 15 Sep	KLM
22 Aug - 06 Sep	SWISS
24 Aug - 06 Sep	SWISS
18 Aug - 01 Sep	KLM
20 Aug - 03 Sep	KLM
20 Aug - 30 Aug	SWISS
11 Aug - 26 Aug	Aer Lingus
28 Aug - 07 Sep	KLM
19 Aug - 08 Sep	KLM
20 Aug - 31 Aug	KLM
17 Aug - 31 Aug	KLM
17 Aug - 30 Aug	SWISS
12 Aug - 30 Aug	SWISS
08 Aug - 29 Aug	KLM
19 Aug - 24 Aug	KLM
21 Aug - 24 Aug	KLM
10 Aug - 30 Aug	SWISS

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

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 August from $752

Return flights