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

Return flights

23 Sep - 17 Oct	Ryanair
17 Sep - 15 Oct	Ryanair
23 Sep - 22 Oct	Ryanair
30 Sep - 23 Oct	Ryanair
13 Sep - 17 Oct	Ryanair
30 Sep - 29 Oct	Ryanair
01 Sep - 17 Oct	Ryanair
25 Sep - 13 Oct	Ryanair
30 Sep - 14 Oct	Ryanair
21 Sep - 20 Oct	Ryanair
13 Sep - 16 Sep	Ryanair
11 Sep - 17 Sep	Pegasus Airlines
19 Sep - 22 Sep	Ryanair
12 Sep - 22 Sep	Ryanair
08 Sep - 18 Sep	Ryanair
11 Sep - 18 Sep	AJet
17 Sep - 24 Sep	Ryanair
14 Sep - 22 Sep	Ryanair
16 Sep - 22 Sep	Ryanair
15 Sep - 22 Sep	Ryanair

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 $887

Return flights