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
05 Dec - 14 Dec	TAP
03 Dec - 10 Dec	TAP
08 Dec - 15 Dec	British Airways
01 Dec - 08 Dec	British Airways
09 Dec - 16 Dec	British Airways
24 Dec - 10 Jan	Air Canada
25 Dec - 10 Jan	Air Canada
26 Dec - 10 Jan	Air Canada
16 Dec - 23 Dec	British Airways
31 Dec - 07 Jan	Air Canada
15 Dec - 22 Dec	TAP
11 Dec - 18 Dec	British Airways
30 Dec - 06 Jan	Lufthansa
29 Dec - 05 Jan	SWISS
25 Dec - 01 Jan	Air Canada
26 Dec - 02 Jan	Air Canada
27 Dec - 03 Jan	Air Canada
29 Dec - 03 Jan	British Airways

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 $522

Return flights