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

Return flights

21 Sep - 07 Oct	Finnair
30 Sep - 16 Oct	Iberia
21 Sep - 30 Sep	Finnair
22 Sep - 30 Sep	Finnair
01 Sep - 11 Sep	Virgin Atlantic
03 Sep - 11 Sep	Delta
03 Sep - 12 Sep	Air France
01 Sep - 10 Sep	Delta
02 Sep - 11 Sep	Delta
15 Sep - 23 Oct	Air France
10 Sep - 21 Oct	Air France
13 Sep - 21 Oct	Air France
29 Sep - 13 Oct	Air France
24 Sep - 09 Oct	Delta
30 Sep - 07 Oct	Porter Airlines (Canada) Ltd
03 Sep - 24 Sep	Air France
15 Sep - 24 Sep	Air France
03 Sep - 10 Sep	Air France
17 Sep - 01 Oct	Air France
22 Sep - 01 Oct	Air France

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 259€

Return flights