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

Return flights

22 Sep - 19 Oct	WestJet
23 Sep - 17 Oct	Porter Airlines (Canada) Ltd
23 Sep - 30 Sep	Porter Airlines (Canada) Ltd
30 Sep - 27 Oct	Air Transat
29 Sep - 18 Oct	Porter Airlines (Canada) Ltd
21 Sep - 28 Sep	WestJet
26 Sep - 13 Oct	China Eastern
26 Sep - 03 Oct	China Eastern
17 Sep - 17 Oct	Flair Airlines
27 Sep - 14 Oct	Air Transat
22 Sep - 20 Oct	WestJet
27 Sep - 18 Oct	Air Transat
20 Sep - 30 Sep	WestJet
18 Sep - 25 Sep	Cathay Pacific
19 Sep - 24 Sep	WestJet
19 Sep - 26 Sep	WestJet
20 Sep - 27 Sep	WestJet
21 Sep - 22 Sep	Air Canada

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 984€

Return flights