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

Return flights

24 Sep - 08 Oct	TAP
28 Sep - 16 Oct	SWISS
28 Sep - 08 Oct	TAP
10 Sep - 18 Sep	TAP
14 Sep - 25 Sep	TAP
26 Sep - 08 Oct	TAP
08 Sep - 18 Sep	TAP
21 Sep - 05 Oct	FrenchBee
29 Sep - 06 Oct	FrenchBee
09 Sep - 15 Sep	Air Canada	direct
04 Sep - 15 Sep	Air Canada	direct
09 Sep - 16 Sep	Air Canada	direct
11 Sep - 24 Sep	Air Canada	direct
08 Sep - 15 Sep	Air Canada
02 Sep - 10 Sep	Air Canada
05 Sep - 15 Sep	Air Canada
24 Sep - 08 Oct	Air Transat	direct
25 Sep - 02 Oct	Air Transat
21 Sep - 02 Oct	Air Transat
20 Sep - 02 Oct	Air Canada	direct

Also check the deals for one-way 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 return flights from Montreal to Barcelona in September from 378€

Return flights