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

Return flights

16 Sep - 24 Sep	Air Canada	direct
08 Sep - 14 Sep	Lufthansa	direct
15 Sep - 24 Sep	Air Canada	direct
15 Sep - 23 Sep	Air Canada	direct
08 Sep - 16 Sep	Air Canada	direct
15 Sep - 26 Sep	Air Canada	direct
04 Sep - 10 Sep	Air Canada	direct
09 Sep - 16 Sep	Air Canada	direct
16 Sep - 23 Sep	Air Canada	direct
11 Sep - 19 Sep	Air Canada
15 Sep - 10 Oct	Lufthansa
25 Sep - 02 Oct	Air Canada
24 Sep - 23 Oct	Air France
05 Sep - 23 Oct	KLM
10 Sep - 08 Oct	Delta
24 Sep - 15 Oct	Delta
29 Sep - 08 Oct	Delta
28 Sep - 08 Oct	TAP
30 Sep - 07 Oct	Brussels Airlines
10 Sep - 20 Oct	Air France

Also check the deals for one-way 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 return flights from Montreal to Madrid in September from $520

Return flights