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
21 Sep - 04 Oct	FrenchBee
29 Sep - 06 Oct	FrenchBee
14 Sep - 26 Sep	FrenchBee
15 Sep - 29 Sep	FrenchBee
19 Sep - 26 Sep	FrenchBee
22 Sep - 29 Sep	FrenchBee
12 Sep - 22 Sep	FrenchBee
01 Sep - 22 Sep	FrenchBee
14 Sep - 29 Sep	FrenchBee
29 Sep - 20 Oct	FrenchBee
08 Sep - 15 Sep	FrenchBee
19 Sep - 06 Oct	FrenchBee
24 Sep - 07 Oct	Porter Airlines (Canada) Ltd
15 Sep - 25 Sep	Air Transat
29 Sep - 07 Oct	WestJet
19 Sep - 23 Oct	FrenchBee
28 Sep - 05 Oct	WestJet
30 Sep - 07 Oct	Porter Airlines (Canada) Ltd
10 Sep - 02 Oct	FrenchBee

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 415€

Return flights