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

Return flights

22 Sep - 24 Oct	Shenzhen Airlines
22 Sep - 26 Sep	Shenzhen Airlines
27 Sep - 17 Oct	Shenzhen Airlines
27 Sep - 15 Oct	Shenzhen Airlines
28 Sep - 18 Oct	Shenzhen Airlines
26 Sep - 12 Oct	Hainan Airlines
26 Sep - 05 Oct	Hainan Airlines
28 Sep - 11 Oct	Shenzhen Airlines
27 Sep - 06 Oct	Shenzhen Airlines
28 Sep - 06 Oct	Shenzhen Airlines
24 Sep - 15 Oct	Hainan Airlines
23 Sep - 29 Sep	Gulf Air
22 Sep - 30 Sep	Gulf Air
24 Sep - 29 Sep	Gulf Air
22 Sep - 29 Sep	Gulf Air
24 Sep - 30 Sep	Gulf Air
25 Sep - 29 Sep	Gulf Air
25 Sep - 30 Sep	Gulf Air
23 Sep - 30 Sep	Gulf Air
26 Sep - 30 Sep	Etihad Airways

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 433€

Return flights