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

Return flights

29 Sep - 05 Oct	Etihad Airways
30 Sep - 03 Oct	Etihad Airways
22 Sep - 29 Sep	IndiGo
29 Sep - 02 Oct	Etihad Airways
23 Sep - 30 Sep	Turkish Airlines
25 Sep - 30 Sep	Air India
23 Sep - 06 Oct	Turkish Airlines
26 Sep - 05 Oct	Air India
24 Sep - 02 Oct	Air India
30 Sep - 07 Oct	Etihad Airways
28 Sep - 02 Oct	Gulf Air
27 Sep - 11 Oct	Gulf Air
26 Sep - 06 Oct	Gulf Air
26 Sep - 29 Sep	Air India
22 Sep - 28 Sep	Air India
22 Sep - 24 Sep	Air India
26 Sep - 28 Sep	Air India
23 Sep - 28 Sep	Air India
29 Sep - 29 Sep	Air India
24 Sep - 28 Sep	Air India

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 504€

Return flights