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

Return flights

16 Sep - 23 Sep	Ryanair
15 Sep - 22 Sep	Ryanair
27 Sep - 14 Oct	Pegasus Airlines
29 Sep - 02 Oct	Pegasus Airlines
29 Sep - 30 Oct	AJet
27 Sep - 07 Oct	Pegasus Airlines
08 Sep - 15 Sep	Pegasus Airlines
06 Sep - 17 Sep	Ryanair
29 Sep - 21 Oct	Pegasus Airlines
15 Sep - 21 Sep	Pegasus Airlines
08 Sep - 21 Sep	Pegasus Airlines
09 Sep - 22 Sep	Pegasus Airlines
09 Sep - 18 Sep	Ryanair
05 Sep - 21 Oct	Pegasus Airlines
09 Sep - 14 Oct	Pegasus Airlines
27 Sep - 02 Oct	Pegasus Airlines
11 Sep - 22 Sep	Ryanair
10 Sep - 17 Sep	Ryanair
26 Sep - 12 Oct	Pegasus Airlines
19 Sep - 02 Oct	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 496€

Return flights