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

Return flights

22 Sep - 12 Oct	KLM
23 Sep - 07 Oct	Lufthansa
22 Sep - 29 Sep	KLM
29 Sep - 12 Oct	KLM
17 Sep - 11 Oct	KLM
22 Sep - 28 Oct	KLM
17 Sep - 18 Oct	KLM
12 Sep - 16 Sep	KLM
26 Sep - 18 Oct	KLM
29 Sep - 11 Oct	KLM
22 Sep - 04 Oct	KLM
29 Sep - 13 Oct	KLM
15 Sep - 29 Sep	KLM
19 Sep - 27 Sep	KLM
10 Sep - 20 Sep	KLM
10 Sep - 26 Sep	KLM
10 Sep - 23 Sep	KLM
18 Sep - 22 Sep	SWISS
20 Sep - 30 Sep	KLM
12 Sep - 29 Sep	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 938€

Return flights