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

Return flights

16 Sep - 20 Oct	China Eastern
15 Sep - 27 Oct	China Southern
22 Sep - 14 Oct	China Southern
22 Sep - 15 Oct	China Southern
22 Sep - 12 Oct	China Southern
22 Sep - 13 Oct	China Southern
16 Sep - 03 Oct	China Eastern
14 Sep - 23 Oct	China Southern
21 Sep - 04 Oct	China Southern
08 Sep - 02 Oct	China Eastern
07 Sep - 28 Sep	Air India
01 Sep - 30 Sep	Air India
02 Sep - 30 Sep	Air India
15 Sep - 29 Sep	Air India
15 Sep - 28 Sep	Air India
16 Sep - 30 Sep	Air India
23 Sep - 29 Sep	Air India
21 Sep - 30 Sep	Air India
08 Sep - 29 Sep	Air India
22 Sep - 29 Sep	Air India

Also check the deals for one-way flights from London to Sydney 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 Sydney in September from 718€

Return flights