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

Return flights

29 Aug - 10 Sep	Shenzhen Airlines
29 Aug - 06 Sep	Shenzhen Airlines
30 Aug - 06 Sep	Shenzhen Airlines
30 Aug - 04 Sep	Shenzhen Airlines
29 Aug - 07 Sep	Shenzhen Airlines
30 Aug - 11 Sep	Shenzhen Airlines
30 Aug - 12 Sep	Shenzhen Airlines
29 Aug - 05 Sep	Shenzhen Airlines
31 Aug - 09 Sep	Shenzhen Airlines
29 Aug - 14 Sep	Shenzhen Airlines
20 Aug - 27 Aug	Air India
11 Aug - 16 Aug	SWISS
12 Aug - 17 Aug	SWISS
20 Aug - 23 Aug	Air India
19 Aug - 22 Aug	Air India
24 Aug - 27 Aug	Air India
06 Aug - 13 Aug	KLM
06 Aug - 12 Aug	KLM
13 Aug - 16 Aug	British Airways
08 Aug - 17 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 $586

Return flights