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

Return flights

16 Sep - 28 Sep	Air Transat	direct
18 Sep - 28 Sep	Air Transat	direct
02 Sep - 28 Sep	Air Transat	direct
02 Sep - 12 Sep	Air Transat	direct
18 Sep - 22 Sep	Air Transat	direct
04 Sep - 10 Sep	Air Transat	direct
10 Sep - 17 Sep	Air Canada
16 Sep - 25 Sep	Air Canada
25 Sep - 29 Sep	Lufthansa
03 Sep - 11 Sep	Lufthansa
17 Sep - 02 Oct	Air Canada
30 Sep - 12 Oct	Air Canada
29 Sep - 12 Oct	Air Canada
29 Sep - 12 Oct	Air Transat	direct
22 Sep - 03 Oct	Air Canada
22 Sep - 03 Oct	Air Transat	direct
29 Sep - 04 Oct	easyJet

Also check the deals for one-way flights from Madrid to Montreal 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 return flights from Madrid to Montreal in September from $414

Return flights