AirHint found the following cheapest one-way flights from Montreal (YUL) to Barcelona (BCN) in August 2025 (see full year).

One-Way flights

07 Aug	Porter Airlines (Canada) Ltd
24 Aug	FrenchBee
29 Aug	FrenchBee
12 Aug	FrenchBee
14 Aug	Porter Airlines (Canada) Ltd
01 Aug	Porter Airlines (Canada) Ltd
17 Aug	Porter Airlines (Canada) Ltd
13 Aug	Porter Airlines (Canada) Ltd
02 Aug	Porter Airlines (Canada) Ltd
08 Aug	Air Transat

Also check the deals for return flights from Montreal to Barcelona 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 one-way flights from Montreal to Barcelona in August from $318

One-Way flights