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

Return flights

30 Aug - 06 Sep	Air Canada
26 Aug - 02 Sep	Lufthansa
25 Aug - 01 Sep	United
19 Aug - 26 Aug	Air Canada
19 Aug - 24 Aug	Air Canada
14 Aug - 04 Sep	United
22 Aug - 29 Aug	Air Canada
15 Aug - 05 Sep	Air Canada
12 Aug - 22 Aug	Air Canada
21 Aug - 28 Aug	British Airways
08 Aug - 17 Aug	Air Transat
08 Aug - 31 Aug	Lufthansa
18 Aug - 25 Aug	Air Canada
25 Aug - 29 Aug	United
15 Aug - 29 Aug	Air Canada
25 Aug - 01 Sep	Air Transat	direct
14 Aug - 04 Sep	Air Transat	direct

Also check the deals for one-way flights from Porto to Toronto in August.

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 August from 427€

Return flights