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

Return flights

09 Sep - 15 Sep	Qantas
15 Sep - 29 Sep	Qantas
04 Sep - 25 Sep	Asiana Airlines
02 Sep - 27 Sep	Asiana Airlines
03 Sep - 17 Sep	Asiana Airlines
11 Sep - 15 Sep	Asiana Airlines
25 Sep - 09 Oct	China Airlines
11 Sep - 22 Sep	Vietnam Airlines
11 Sep - 02 Oct	Turkish Airlines
07 Sep - 23 Sep	Air India
15 Sep - 30 Sep	Turkish Airlines
13 Sep - 01 Oct	Turkish Airlines
11 Sep - 26 Sep	Turkish Airlines
13 Sep - 02 Oct	Turkish Airlines
13 Sep - 03 Oct	Turkish Airlines
18 Sep - 11 Oct	Air India
17 Sep - 05 Oct	China Airlines
21 Sep - 05 Oct	China Airlines
24 Sep - 10 Oct	China Airlines
24 Sep - 09 Oct	Air India

Also check the deals for one-way flights from Sydney 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 Sydney to London in September from 822€

Return flights