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

Return flights

07 Sep - 14 Sep	AirAsia
12 Sep - 19 Sep	AirAsia
23 Sep - 30 Sep	Saudia
16 Sep - 23 Sep	Etihad Airways
30 Sep - 07 Oct	Etihad Airways
29 Sep - 06 Oct	Etihad Airways
16 Sep - 26 Sep	Etihad Airways
24 Sep - 09 Oct	Etihad Airways
21 Sep - 26 Sep	Etihad Airways
23 Sep - 03 Oct	Etihad Airways
25 Sep - 06 Oct	Etihad Airways
08 Sep - 15 Sep	China Eastern
17 Sep - 23 Sep	Etihad Airways
17 Sep - 24 Sep	Gulf Air
03 Sep - 10 Sep	China Eastern
25 Sep - 09 Oct	Etihad Airways
29 Sep - 05 Oct	Etihad Airways
24 Sep - 01 Oct	Etihad Airways
25 Sep - 15 Oct	Etihad Airways
26 Sep - 03 Oct	Etihad Airways

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 $575

Return flights