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

Return flights

04 Sep - 18 Sep	Lufthansa
15 Sep - 28 Oct	KLM
04 Sep - 05 Oct	ITA Airways
15 Sep - 13 Oct	KLM
04 Sep - 11 Sep	SWISS
08 Sep - 21 Sep	KLM
27 Sep - 28 Oct	KLM
01 Sep - 07 Sep	Air Dolomiti
01 Sep - 15 Sep	KLM
14 Sep - 21 Sep	KLM
17 Sep - 11 Oct	KLM
15 Sep - 22 Sep	KLM
30 Sep - 29 Oct	ITA Airways
01 Sep - 14 Sep	KLM
15 Sep - 29 Sep	KLM
14 Sep - 04 Oct	KLM
08 Sep - 15 Sep	KLM
15 Sep - 15 Oct	KLM
28 Sep - 13 Oct	KLM
23 Sep - 29 Oct	ITA Airways

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.

Book a cheap hotel in Perth

Cheap car rent in Perth

Cheapest return flights from London to Perth in September from 861€

Return flights