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
28 Aug - 03 Sep	SWISS
25 Aug - 31 Aug	Lufthansa
19 Aug - 26 Aug	Air Transat	direct
12 Aug - 26 Aug	United
06 Aug - 13 Aug	Lufthansa
01 Aug - 04 Aug	United
18 Aug - 25 Aug	TAP

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 $444

Return flights