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

Return flights

08 Sep - 21 Sep	Air Transat
08 Sep - 22 Sep	Air Transat
10 Sep - 22 Sep	Air Canada
17 Sep - 22 Sep	Air Canada
09 Sep - 14 Sep	Air Transat
11 Sep - 25 Sep	Air Transat
11 Sep - 12 Sep	Air Transat
04 Sep - 08 Sep	Air Canada
10 Sep - 14 Sep	Air Canada
08 Sep - 15 Sep	Air Transat
25 Sep - 02 Oct	Air Transat
27 Sep - 05 Oct	Air Transat
20 Sep - 02 Oct	Air Canada
27 Sep - 02 Oct	Air Transat
26 Sep - 05 Oct	SWISS
25 Sep - 07 Oct	SWISS
28 Sep - 07 Oct	SWISS
28 Sep - 03 Oct	Air Transat
24 Sep - 08 Oct	Air Transat
16 Sep - 10 Oct	SWISS

Also check the deals for one-way flights from Lisbon to Toronto 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 Lisbon to Toronto in September from 403€

Return flights