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

Return flights

24 Aug - 31 Aug	Hainan Airlines
24 Aug - 10 Sep	Hainan Airlines
24 Aug - 28 Aug	Hainan Airlines
24 Aug - 30 Aug	Hainan Airlines
19 Aug - 26 Aug	China Eastern
16 Aug - 07 Sep	China Eastern
16 Aug - 02 Sep	China Eastern
16 Aug - 25 Aug	China Eastern
21 Aug - 02 Sep	China Eastern
20 Aug - 27 Aug	AirAsia
17 Aug - 21 Aug	China Eastern
25 Aug - 12 Sep	AirAsia
23 Aug - 29 Aug	China Eastern
27 Aug - 14 Sep	Scoot
23 Aug - 30 Aug	China Southern
27 Aug - 20 Sep	Scoot
21 Aug - 01 Sep	AirAsia
18 Aug - 25 Aug	China Eastern
16 Aug - 06 Sep	Air China
20 Aug - 07 Sep	China Southern

Also check the deals for one-way flights from Singapore to London 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 Singapore to London in August from 566€

Return flights