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

Return flights

06 Sep - 20 Sep	KLM
03 Sep - 10 Sep	KLM
02 Sep - 10 Sep	KLM
04 Sep - 10 Sep	KLM
04 Sep - 14 Sep	KLM
04 Sep - 11 Sep	KLM
04 Sep - 12 Sep	KLM
19 Sep - 28 Sep	Air Transat	direct
06 Sep - 20 Sep	Air Transat	direct
06 Sep - 15 Sep	Air Transat	direct
29 Sep - 13 Oct	Air Canada
26 Sep - 04 Oct	Air Canada	direct
27 Sep - 11 Oct	Vueling Airlines
27 Sep - 04 Oct	Brussels Airlines
27 Sep - 12 Oct	Brussels Airlines
27 Sep - 11 Oct	Air Transat	direct
27 Sep - 12 Oct	Air Transat	direct
27 Sep - 04 Oct	Air Transat	direct

Also check the deals for one-way flights from Barcelona 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 Barcelona to Montreal in September from $451

Return flights