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

Return flights

09 Sep - 15 Oct	KLM
17 Sep - 29 Sep	KLM
09 Sep - 30 Sep	KLM
18 Sep - 22 Sep	SWISS
11 Sep - 25 Sep	SWISS
11 Sep - 18 Sep	SWISS
18 Sep - 25 Sep	SWISS
09 Sep - 16 Sep	SWISS
09 Sep - 25 Sep	SWISS
11 Sep - 15 Sep	SWISS
11 Sep - 29 Sep	SWISS
15 Sep - 20 Oct	SWISS
15 Sep - 07 Oct	SWISS
22 Sep - 01 Oct	SWISS
21 Sep - 12 Oct	SWISS
17 Sep - 22 Oct	SWISS
08 Sep - 06 Oct	SWISS
25 Sep - 09 Oct	SWISS
25 Sep - 08 Oct	SWISS
16 Sep - 09 Oct	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 $690

Return flights