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

Return flights

05 Dec - 12 Dec	TAP
07 Dec - 14 Dec	TAP
08 Dec - 15 Dec	TAP
12 Dec - 19 Dec	TAP
24 Dec - 31 Dec	Air Canada
14 Dec - 21 Dec	TAP
01 Dec - 08 Dec	Aer Lingus
02 Dec - 09 Dec	Aer Lingus
03 Dec - 10 Dec	FrenchBee
25 Dec - 01 Jan	Lufthansa
31 Dec - 07 Jan	Air Canada
10 Dec - 17 Dec	Lufthansa
26 Dec - 02 Jan	Air Canada
30 Dec - 06 Jan	Lufthansa
28 Dec - 04 Jan	Air Canada
29 Dec - 05 Jan	Lufthansa
21 Dec - 15 Jan	Air Canada
21 Dec - 16 Jan	Air Canada
27 Dec - 03 Jan	Air Canada
19 Dec - 05 Jan	Air Canada

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

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 December from $587

Return flights