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

Return flights

11 Sep - 02 Oct	Scoot
07 Sep - 20 Sep	Jetstar
10 Sep - 21 Sep	Cathay Pacific
17 Sep - 06 Oct	AirAsia
08 Sep - 13 Sep	Thai Airways
08 Sep - 23 Sep	Thai Airways
11 Sep - 18 Sep	Thai Airways
13 Sep - 20 Sep	Thai Airways
08 Sep - 21 Sep	Thai Airways
08 Sep - 29 Sep	Malaysia Airlines
10 Sep - 10 Oct	Thai Airways
17 Sep - 07 Oct	Malaysia Airlines
14 Sep - 10 Oct	Thai Airways
29 Sep - 21 Oct	Thai Airways
30 Sep - 09 Oct	Malaysia Airlines
18 Sep - 10 Oct	Malaysia Airlines
22 Sep - 11 Oct	Malaysia Airlines
18 Sep - 11 Oct	Malaysia Airlines
21 Sep - 28 Sep	Thai Airways
25 Sep - 29 Sep	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.

Book a cheap hotel in Kathmandu

Cheap car rent in Kathmandu

Cheapest return flights from Perth to Kathmandu in September from 486€

Return flights