AirHint found the following cheapest return flights from London (LCY) to Perth (PER) in September 2025 (see full year).

Return flights

17 Sep - 22 Oct	British Airways
08 Sep - 22 Oct	British Airways
22 Sep - 05 Oct	British Airways
24 Sep - 05 Oct	British Airways
16 Sep - 23 Sep	SWISS
12 Sep - 14 Sep	British Airways
08 Sep - 14 Sep	KLM
16 Sep - 24 Sep	SWISS
07 Sep - 14 Sep	KLM
23 Sep - 02 Oct	SWISS
18 Sep - 21 Sep	British Airways
08 Sep - 15 Sep	KLM
08 Sep - 21 Sep	British Airways
10 Sep - 17 Sep	British Airways
10 Sep - 22 Sep	British Airways
24 Sep - 06 Oct	British Airways
23 Sep - 12 Oct	British Airways
24 Sep - 12 Oct	British Airways
29 Sep - 05 Oct	SWISS
24 Sep - 01 Oct	KLM

Also check the deals for one-way flights from London to Perth 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 Perth in September from $1479

Return flights