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

Return flights

01 Sep - 12 Oct	Air India
21 Sep - 21 Oct	Air India
22 Sep - 12 Oct	Air India
09 Sep - 24 Sep	Air India
03 Sep - 01 Oct	Air India
10 Sep - 01 Oct	Air India
17 Sep - 01 Oct	Air India
24 Sep - 15 Oct	Air India
10 Sep - 15 Oct	Air India
24 Sep - 16 Oct	Air India
10 Sep - 24 Sep	Air India
17 Sep - 08 Oct	Air India
12 Sep - 24 Sep	Air India
09 Sep - 23 Sep	Air India
22 Sep - 29 Sep	Air India
03 Sep - 30 Sep	Air India
02 Sep - 30 Sep	Air India
21 Sep - 30 Sep	Air India
21 Sep - 28 Sep	Air India
23 Sep - 30 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 779€

Return flights