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

Return flights

09 Sep - 15 Sep	Air Transat
14 Sep - 21 Sep	Air Transat
19 Sep - 23 Sep	Air Transat
23 Sep - 28 Sep	Air Transat
09 Sep - 14 Sep	Air Transat
08 Sep - 15 Sep	Air Transat
26 Sep - 30 Sep	Air Transat
08 Sep - 11 Sep	Air Transat	direct
13 Sep - 21 Sep	Air Transat	direct
09 Sep - 24 Sep	Air Transat
20 Sep - 04 Oct	Air Transat
25 Sep - 05 Oct	Air Transat	direct
29 Sep - 08 Oct	Air Transat
30 Sep - 03 Oct	Air Transat
29 Sep - 08 Oct	Air Transat	direct
30 Sep - 03 Oct	Air Transat	direct

Also check the deals for one-way flights from Porto 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 Porto to Toronto in September from 410€

Return flights