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

Return flights

17 Sep - 29 Sep	Lufthansa
09 Sep - 22 Sep	Lufthansa
23 Sep - 28 Sep	Air Transat
12 Sep - 21 Sep	Air Transat
19 Sep - 03 Oct	Air Transat
30 Sep - 05 Oct	Lufthansa
11 Sep - 15 Sep	Lufthansa
16 Sep - 28 Sep	Lufthansa
23 Sep - 30 Sep	Air Canada
22 Sep - 28 Sep	Air Canada
15 Sep - 21 Sep	Air Canada
15 Sep - 29 Sep	Lufthansa
20 Sep - 04 Oct	Air Canada
18 Sep - 02 Oct	Air Canada
02 Sep - 01 Oct	Air Transat
30 Sep - 05 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 362€

Return flights