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

Return flights

24 Sep - 04 Oct	Iberia
30 Sep - 21 Oct	Air Transat
17 Sep - 01 Oct	Porter Airlines (Canada) Ltd
27 Sep - 08 Oct	Air Transat
27 Sep - 07 Oct	Air Transat
16 Sep - 08 Oct	Air Transat
26 Sep - 18 Oct	Royal Air Maroc
03 Sep - 10 Sep	Air Transat
07 Sep - 18 Sep	Air Transat
06 Sep - 10 Sep	Air Transat
02 Sep - 09 Sep	Air Transat
03 Sep - 11 Sep	Air Transat	direct
24 Sep - 08 Oct	Air Transat
27 Sep - 09 Oct	Air Transat
28 Sep - 09 Oct	Air Transat
02 Sep - 16 Sep	Air Transat
08 Sep - 18 Sep	Air Transat
09 Sep - 16 Sep	Air Transat
03 Sep - 18 Sep	Air Transat
03 Sep - 08 Sep	Air Transat

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 $323

Return flights