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

Return flights

03 Sep - 16 Oct	Cathay Pacific
03 Sep - 01 Oct	Cathay Pacific
10 Sep - 16 Oct	Cathay Pacific
11 Sep - 16 Oct	Cathay Pacific
10 Sep - 10 Oct	Cathay Pacific
04 Sep - 11 Sep	Cathay Pacific
05 Sep - 06 Oct	Cathay Pacific
05 Sep - 05 Oct	Cathay Pacific
07 Sep - 06 Oct	Cathay Pacific
03 Sep - 16 Sep	Cathay Pacific
17 Sep - 05 Oct	Cathay Pacific
10 Sep - 21 Oct	Cathay Pacific
01 Sep - 30 Sep	Porter Airlines (Canada) Ltd
01 Sep - 15 Sep	Porter Airlines (Canada) Ltd
11 Sep - 24 Sep	Air India
02 Sep - 16 Sep	Emirates
01 Sep - 08 Sep	Cathay Pacific
01 Sep - 10 Sep	Cathay Pacific
21 Sep - 28 Sep	Qatar Airways
11 Sep - 30 Sep	Emirates

Also check the deals for one-way flights from Toronto 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 Toronto to Kathmandu in September from 834€

Return flights