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

Return flights

30 Sep - 25 Oct	AirAsia
11 Sep - 02 Oct	Thai Airways
02 Sep - 16 Sep	Cathay Pacific
09 Sep - 22 Sep	Cathay Pacific
01 Sep - 30 Sep	Cathay Pacific
07 Sep - 14 Sep	Cathay Pacific
24 Sep - 31 Oct	AirAsia
08 Sep - 29 Sep	Thai Airways
04 Sep - 16 Oct	Thai Airways
02 Sep - 07 Oct	Thai Airways
16 Sep - 07 Oct	Thai Airways
17 Sep - 24 Sep	Cathay Pacific
20 Sep - 07 Oct	Thai Airways
22 Sep - 13 Oct	Cathay Pacific
25 Sep - 10 Oct	AirAsia
20 Sep - 04 Oct	Thai Airways

Also check the deals for one-way flights from Perth to Kathmandu 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 Kathmandu in September from 576€

Return flights