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

Return flights

30 Sep - 07 Oct	IndiGo
29 Sep - 06 Oct	IndiGo
24 Sep - 01 Oct	IndiGo
28 Sep - 05 Oct	IndiGo
26 Sep - 03 Oct	IndiGo
25 Sep - 02 Oct	IndiGo
26 Sep - 30 Sep	IndiGo
29 Sep - 02 Oct	IndiGo
22 Sep - 29 Sep	Etihad Airways
23 Sep - 30 Sep	IndiGo
21 Sep - 28 Sep	IndiGo
21 Sep - 27 Sep	IndiGo
23 Sep - 27 Sep	Etihad Airways
20 Sep - 03 Oct	Air India
20 Sep - 22 Sep	Air India
19 Sep - 26 Sep	Air India
20 Sep - 27 Sep	Air India
27 Sep - 03 Oct	Air India
27 Sep - 11 Oct	Air India
24 Sep - 30 Sep	Emirates

Also check the deals for one-way flights from Singapore to London 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 Singapore to London in September from $516

Return flights