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

Return flights

01 Sep - 15 Sep	Malaysia Airlines
01 Sep - 30 Sep	Malaysia Airlines
15 Sep - 20 Sep	Cathay Pacific
15 Sep - 15 Oct	Cathay Pacific
20 Sep - 24 Oct	Thai Airways
30 Sep - 19 Oct	Malaysia Airlines
21 Sep - 10 Oct	Qantas
29 Sep - 24 Oct	Thai Airways
25 Sep - 14 Oct	Malaysia Airlines
24 Sep - 14 Oct	Malaysia Airlines
25 Sep - 17 Oct	Malaysia Airlines
12 Sep - 02 Oct	IndiGo
20 Sep - 12 Oct	IndiGo

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 $675

Return flights