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

Return flights

22 Sep - 19 Oct	SWISS
08 Sep - 15 Sep	SWISS
18 Sep - 21 Sep	ITA Airways
01 Sep - 09 Sep	SWISS
15 Sep - 18 Oct	KLM
21 Sep - 12 Oct	KLM
21 Sep - 18 Oct	KLM
01 Sep - 07 Sep	SWISS
28 Sep - 12 Oct	KLM
19 Sep - 20 Oct	Lufthansa
29 Sep - 07 Oct	SWISS
07 Sep - 12 Oct	KLM
15 Sep - 28 Oct	KLM
03 Sep - 09 Sep	SWISS
15 Sep - 13 Oct	KLM
15 Sep - 22 Sep	KLM
02 Sep - 09 Sep	SWISS
08 Sep - 21 Sep	SWISS
15 Sep - 27 Sep	KLM
01 Sep - 22 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 851€

Return flights