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

Return flights

06 Sep - 18 Oct	Shenzhen Airlines
21 Sep - 14 Oct	Shenzhen Airlines
22 Sep - 11 Oct	Shenzhen Airlines
17 Sep - 18 Oct	Hainan Airlines
26 Sep - 18 Oct	Saudia
26 Sep - 11 Oct	Saudia
27 Sep - 18 Oct	Saudia
29 Sep - 20 Oct	Saudia
22 Sep - 28 Oct	Shenzhen Airlines
17 Sep - 25 Oct	Hainan Airlines
02 Sep - 07 Sep	Air China
16 Sep - 23 Sep	Air India
08 Sep - 27 Sep	Shenzhen Airlines
07 Sep - 23 Sep	Shenzhen Airlines
03 Sep - 24 Sep	Shenzhen Airlines
17 Sep - 21 Sep	Etihad Airways
05 Sep - 21 Sep	Saudia
15 Sep - 21 Sep	Etihad Airways
14 Sep - 28 Sep	Air China
04 Sep - 15 Sep	Saudia

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 605€

Return flights