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

Return flights

24 Sep - 07 Oct	AirAsia
24 Sep - 08 Oct	AirAsia
24 Sep - 30 Sep	AirAsia
24 Sep - 04 Oct	AirAsia
15 Sep - 18 Sep	AirAsia
15 Sep - 30 Sep	AirAsia
15 Sep - 17 Sep	AirAsia
15 Sep - 04 Oct	AirAsia
29 Sep - 07 Oct	AirAsia
29 Sep - 08 Oct	AirAsia
24 Sep - 03 Oct	AirAsia
29 Sep - 15 Oct	AirAsia
29 Sep - 30 Sep	AirAsia
29 Sep - 04 Oct	AirAsia
18 Sep - 07 Oct	AirAsia
15 Sep - 24 Sep	AirAsia
18 Sep - 30 Sep	AirAsia
18 Sep - 24 Sep	AirAsia
25 Sep - 30 Sep	AirAsia
22 Sep - 30 Sep	AirAsia

Also check the deals for one-way flights from Chiang Mai 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 Chiang Mai to Perth in September from $424

Return flights