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

Return flights

17 Sep - 24 Sep	Malaysia Airlines
17 Sep - 28 Sep	Malaysia Airlines
16 Sep - 23 Sep	Singapore Airlines
15 Sep - 21 Sep	Singapore Airlines
10 Sep - 22 Sep	Cathay Pacific
10 Sep - 23 Sep	Cathay Pacific
08 Sep - 16 Sep	Cathay Pacific
08 Sep - 22 Sep	Cathay Pacific
03 Sep - 10 Sep	Cathay Pacific
15 Sep - 13 Oct	Singapore Airlines
15 Sep - 28 Sep	Singapore Airlines
17 Sep - 01 Oct	Malaysia Airlines
14 Sep - 30 Oct	Cathay Pacific
16 Sep - 15 Oct	Singapore Airlines
16 Sep - 26 Oct	Singapore Airlines
10 Sep - 20 Oct	Cathay Pacific
28 Sep - 20 Oct	Qatar Airways
29 Sep - 21 Oct	Qatar Airways
30 Sep - 21 Oct	Qatar Airways
29 Sep - 20 Oct	Qatar Airways

Also check the deals for one-way flights from Perth to London 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 Perth to London in September from $997

Return flights