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

Return flights

21 Sep - 02 Oct	British Airways
08 Sep - 17 Sep	Delta
08 Sep - 16 Sep	Delta
22 Sep - 01 Oct	Delta
04 Sep - 11 Sep	Delta
23 Sep - 02 Oct	British Airways
30 Sep - 07 Oct	Delta
04 Sep - 16 Sep	Delta
27 Sep - 11 Oct	Delta
23 Sep - 30 Sep	British Airways
22 Sep - 30 Sep	British Airways
21 Sep - 30 Sep	British Airways
30 Sep - 25 Oct	British Airways
23 Sep - 18 Oct	British Airways
22 Sep - 18 Oct	British Airways
22 Sep - 26 Sep	Porter Airlines (Canada) Ltd
20 Sep - 27 Sep	WestJet
09 Sep - 23 Sep	Delta
14 Sep - 02 Oct	Delta
27 Sep - 18 Oct	British Airways

Also check the deals for one-way flights from Toronto to Lisbon 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 Lisbon in September from 401€

Return flights