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

Return flights

23 Sep - 08 Oct	Air India
16 Sep - 07 Oct	Air India
23 Sep - 28 Sep	Air India
17 Sep - 28 Sep	Air India
23 Sep - 11 Oct	Air India
22 Sep - 28 Sep	Air India
21 Sep - 25 Sep	Air India
22 Sep - 26 Sep	Air India
29 Sep - 07 Oct	Air India
24 Sep - 29 Sep	Air India
21 Sep - 26 Sep	Air India
29 Sep - 06 Oct	Pegasus Airlines
25 Sep - 02 Oct	Pegasus Airlines
24 Sep - 21 Oct	Hainan Airlines
23 Sep - 21 Oct	Wizz Air UK
28 Sep - 13 Oct	Wizz Air UK
17 Sep - 26 Oct	Air China
20 Sep - 26 Sep	Wizz Air UK
22 Sep - 30 Sep	Pegasus Airlines
22 Sep - 29 Sep	Pegasus Airlines

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 $435

Return flights