AirHint found the following cheapest return flights from Porto (OPO) to Montreal (YUL) in August 2026 (see full year).

Return flights

26 Aug - 31 Aug	Lufthansa
02 Aug - 27 Aug	Air Transat	direct
25 Aug - 30 Aug	Lufthansa
26 Aug - 31 Aug	Air Transat	direct
12 Aug - 19 Aug	Air Transat
01 Aug - 06 Aug	Air Transat
01 Aug - 01 Sep	Air Transat
20 Aug - 31 Aug	Air Canada	direct
11 Aug - 18 Aug	Air Transat	direct
12 Aug - 19 Aug	Air Canada	direct
01 Aug - 01 Sep	Air Canada	direct
01 Aug - 01 Aug	Air Canada	direct

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 415€

Return flights