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

Return flights

30 Aug - 03 Sep	Air China
25 Aug - 07 Sep	Hainan Airlines
28 Aug - 24 Sep	Etihad Airways
25 Aug - 22 Sep	Air India
25 Aug - 06 Sep	Air India
30 Aug - 04 Sep	Shenzhen Airlines
30 Aug - 14 Sep	Air India
27 Aug - 10 Sep	Finnair
31 Aug - 08 Sep	Finnair
28 Aug - 21 Sep	Finnair
15 Aug - 21 Aug	Air India
12 Aug - 18 Aug	Air India
13 Aug - 18 Aug	Air India
15 Aug - 19 Aug	Air India
13 Aug - 17 Aug	Air India
14 Aug - 17 Aug	Air India
13 Aug - 19 Aug	Air India
14 Aug - 20 Aug	Air India
15 Aug - 18 Aug	Air India
14 Aug - 19 Aug	Air India

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