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

One-Way flights

08 Sep	FrenchBee
07 Sep	FrenchBee
12 Sep	Air Transat
24 Sep	Porter Airlines (Canada) Ltd
26 Sep	Porter Airlines (Canada) Ltd
10 Sep	FrenchBee
19 Sep	FrenchBee
15 Sep	Air Transat
09 Sep	Air Transat
02 Sep	Porter Airlines (Canada) Ltd

Also check the deals for return flights from Montreal to Barcelona in September.

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 September from 250€

One-Way flights