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

Return flights

24 Sep - 13 Oct	SWISS
23 Sep - 28 Oct	SWISS
23 Sep - 14 Oct	SWISS
23 Sep - 13 Oct	SWISS
24 Sep - 20 Oct	SWISS
23 Sep - 21 Oct	SWISS
23 Sep - 07 Oct	SWISS
23 Sep - 22 Oct	SWISS
24 Sep - 08 Oct	SWISS
24 Sep - 02 Oct	SWISS
24 Sep - 30 Sep	SWISS
23 Sep - 28 Sep	SWISS
23 Sep - 29 Sep	SWISS
16 Sep - 24 Sep	SWISS
17 Sep - 29 Sep	SWISS
22 Sep - 30 Sep	SWISS
18 Sep - 29 Sep	SWISS
18 Sep - 28 Sep	SWISS
17 Sep - 28 Sep	SWISS
22 Sep - 29 Sep	SWISS

Also check the deals for one-way flights from London to Singapore in September.

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 September from $735

Return flights