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

Return flights

22 Sep - 20 Oct	Flair Airlines
21 Sep - 28 Sep	WestJet
30 Sep - 27 Oct	Air Transat
22 Sep - 19 Oct	WestJet
22 Sep - 21 Oct	Flair Airlines
23 Sep - 21 Oct	Porter Airlines (Canada) Ltd
19 Sep - 24 Oct	China Eastern
22 Sep - 25 Sep	WestJet
20 Sep - 10 Oct	Biman Bangladesh Airlines
22 Sep - 22 Oct	WestJet
23 Sep - 15 Oct	Porter Airlines (Canada) Ltd
27 Sep - 18 Oct	Air Transat
23 Sep - 30 Sep	Air Transat
18 Sep - 25 Sep	Flair Airlines
20 Sep - 27 Sep	WestJet
20 Sep - 30 Sep	WestJet
19 Sep - 26 Sep	WestJet
18 Sep - 19 Sep	Porter Airlines (Canada) Ltd
21 Sep - 22 Sep	Porter Airlines (Canada) Ltd
22 Sep - 29 Sep	China Southern

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 $1184

Return flights