AirHint found the following cheapest return flights from London (LHR) to Singapore (SIN) in September 2026 (see full year).

Return flights

07 Sep - 21 Sep	Air China
03 Sep - 21 Sep	Air China
09 Sep - 14 Sep	Air China
12 Sep - 18 Sep	Air China
10 Sep - 01 Oct	Aegean Airlines
07 Sep - 11 Sep	Air China
10 Sep - 27 Sep	Aegean Airlines
09 Sep - 14 Oct	Air China
13 Sep - 27 Sep	Oman Air
09 Sep - 30 Sep	Oman Air
10 Sep - 15 Sep	Finnair
01 Sep - 22 Sep	Finnair
28 Sep - 14 Oct	Finnair
28 Sep - 08 Oct	Finnair
29 Sep - 06 Oct	Finnair
30 Sep - 18 Oct	Finnair
29 Sep - 13 Oct	Finnair
28 Sep - 05 Oct	Finnair
24 Sep - 10 Oct	Finnair
28 Sep - 15 Oct	Finnair

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 521€

Return flights