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

Return flights

14 Sep - 20 Sep	Air Canada	direct
29 Sep - 07 Oct	Air Canada	direct
15 Sep - 22 Sep	FrenchBee
23 Sep - 07 Oct	Air Canada
14 Sep - 02 Oct	Lufthansa
08 Sep - 15 Sep	FrenchBee
30 Sep - 07 Oct	Air Canada
15 Sep - 25 Sep	Air Transat
15 Sep - 22 Sep	Air Canada	direct
14 Sep - 25 Sep	Air Canada	direct
15 Sep - 25 Sep	Lufthansa	direct
14 Sep - 27 Sep	Air Canada	direct
14 Sep - 23 Sep	Air Canada	direct
17 Sep - 25 Sep	Air Transat
10 Sep - 02 Oct	Lufthansa
29 Sep - 06 Oct	Lufthansa
27 Sep - 04 Oct	Air Transat
28 Sep - 05 Oct	Air Canada
26 Sep - 07 Oct	Air Canada	direct
24 Sep - 07 Oct	Lufthansa

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 485€

Return flights