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

Return flights

15 Sep - 22 Sep	FrenchBee
15 Sep - 25 Sep	FrenchBee
10 Sep - 16 Sep	FrenchBee
14 Sep - 23 Sep	FrenchBee
10 Sep - 22 Sep	FrenchBee
29 Sep - 07 Oct	FrenchBee
17 Sep - 29 Sep	FrenchBee
29 Sep - 07 Oct	Air Canada	direct
08 Sep - 12 Sep	FrenchBee
19 Sep - 07 Oct	Air Canada	direct
18 Sep - 07 Oct	Air Canada
30 Sep - 07 Oct	Air Canada
29 Sep - 06 Oct	Lufthansa
07 Sep - 11 Sep	FrenchBee
19 Sep - 26 Sep	FrenchBee
14 Sep - 21 Sep	FrenchBee
29 Sep - 10 Oct	FrenchBee
24 Sep - 01 Oct	Porter Airlines (Canada) Ltd
28 Sep - 05 Oct	Air Canada
26 Sep - 07 Oct	Air Transat

Also check the deals for one-way flights from Montreal to Dublin 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 Dublin in September from $482

Return flights