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

Return flights

22 Sep - 18 Oct	Iberia
06 Sep - 10 Sep	Air Transat
08 Sep - 10 Sep	Air Transat
05 Sep - 09 Sep	Air Transat
03 Sep - 09 Sep	Air Transat
04 Sep - 10 Sep	Air France
04 Sep - 12 Sep	Delta
04 Sep - 11 Sep	Air France
03 Sep - 10 Sep	Air France
03 Sep - 24 Sep	Delta
11 Sep - 17 Sep	Air Transat
27 Sep - 03 Oct	WestJet
30 Sep - 07 Oct	British Airways
15 Sep - 03 Oct	Porter Airlines (Canada) Ltd
22 Sep - 05 Oct	British Airways
30 Sep - 06 Oct	British Airways
22 Sep - 06 Oct	British Airways
30 Sep - 09 Oct	British Airways
30 Sep - 15 Oct	British Airways
30 Sep - 25 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.

Book a cheap hotel in Lisbon

Cheap car rent in Lisbon

Cheapest return flights from Toronto to Lisbon in September from $479

Return flights