AirHint found the following cheapest return flights from London (LCY) to Singapore (SIN) in August 2025 (see full year).

Return flights

29 Aug - 17 Sep	SWISS
31 Aug - 09 Sep	SWISS
25 Aug - 17 Sep	SWISS
26 Aug - 21 Sep	Lufthansa
28 Aug - 18 Sep	Lufthansa
29 Aug - 21 Sep	SWISS
31 Aug - 08 Sep	SWISS
27 Aug - 22 Sep	Lufthansa
25 Aug - 22 Sep	SWISS
27 Aug - 08 Sep	Lufthansa
19 Aug - 26 Aug	SWISS
22 Aug - 26 Aug	SWISS
25 Aug - 30 Aug	British Airways
21 Aug - 26 Aug	SWISS
18 Aug - 25 Aug	British Airways
25 Aug - 31 Aug	SWISS
26 Aug - 31 Aug	SWISS
18 Aug - 21 Aug	SWISS
28 Aug - 31 Aug	Lufthansa
19 Aug - 31 Aug	KLM

Also check the deals for one-way flights from London to Singapore 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 Singapore in August from 621€

Return flights