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

Return flights

24 Oct - 31 Oct	Air Transat
03 Oct - 10 Oct	Air Transat
05 Oct - 12 Oct	WestJet
07 Oct - 14 Oct	Air Transat
09 Oct - 16 Oct	Air Transat
10 Oct - 24 Oct	Air Transat
07 Oct - 19 Oct	Air Transat
12 Oct - 19 Oct	Air Transat
02 Oct - 09 Oct	Air Transat
16 Oct - 23 Oct	Air Transat
28 Oct - 04 Nov	British Airways
26 Oct - 02 Nov	FrenchBee
30 Oct - 06 Nov	British Airways
31 Oct - 08 Nov	Porter Airlines (Canada) Ltd
28 Oct - 02 Nov	Air Transat
31 Oct - 07 Nov	Porter Airlines (Canada) Ltd
25 Oct - 01 Nov	Porter Airlines (Canada) Ltd

Also check the deals for one-way flights from Montreal to Dublin in October.

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 October from $506

Return flights