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

One-Way flights

15 Sep	Porter Airlines (Canada) Ltd
07 Sep	Porter Airlines (Canada) Ltd
26 Sep	FrenchBee
01 Sep	Porter Airlines (Canada) Ltd
21 Sep	FrenchBee
03 Sep	Air Transat
10 Sep	FrenchBee
05 Sep	Air Transat
15 Sep	Air Transat	direct
05 Sep	Air Transat	direct

Also check the deals for return flights from Montreal to Madrid 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 Madrid in September from $304

One-Way flights