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

Return flights

30 Aug - 15 Sep	Lufthansa
29 Aug - 01 Sep	Lufthansa
25 Aug - 01 Sep	Lufthansa
24 Aug - 01 Sep	Lufthansa
12 Aug - 18 Aug	Air Canada	direct
01 Aug - 07 Aug	Air Canada
13 Aug - 20 Aug	Air Canada
11 Aug - 17 Aug	United
01 Aug - 07 Aug	Air Transat	direct
10 Aug - 17 Aug	Lufthansa

Also check the deals for one-way flights from Porto to Montreal 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 Montreal in August from 373€

Return flights