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

Return flights

08 Sep - 14 Sep	Scoot Tigerair
11 Sep - 15 Sep	Scoot Tigerair
06 Sep - 09 Sep	AirAsia
27 Sep - 11 Oct	AirAsia
06 Sep - 07 Sep	AirAsia
20 Sep - 11 Oct	AirAsia
06 Sep - 13 Sep	AirAsia
27 Sep - 02 Oct	AirAsia
15 Sep - 20 Sep	Scoot Tigerair
20 Sep - 02 Oct	AirAsia
15 Sep - 02 Oct	AirAsia
27 Sep - 29 Sep	AirAsia
20 Sep - 27 Sep	Scoot Tigerair
20 Sep - 29 Sep	AirAsia
15 Sep - 29 Sep	AirAsia
30 Sep - 11 Oct	AirAsia
30 Sep - 02 Oct	AirAsia

Also check the deals for one-way flights from Kota Kinabalu 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 Kota Kinabalu to Perth in September from $289

Return flights