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

Return flights

08 Dec - 15 Dec	TAP
05 Dec - 12 Dec	TAP
02 Dec - 09 Dec	British Airways
04 Dec - 11 Dec	British Airways
01 Dec - 08 Dec	British Airways
03 Dec - 10 Dec	British Airways
09 Dec - 16 Dec	British Airways
07 Dec - 14 Dec	TAP
24 Dec - 31 Dec	Air Canada
31 Dec - 07 Jan	British Airways
10 Dec - 17 Dec	Lufthansa
25 Dec - 01 Jan	Lufthansa
30 Dec - 06 Jan	Lufthansa
29 Dec - 05 Jan	SWISS
26 Dec - 02 Jan	Air Canada
28 Dec - 04 Jan	Air Canada
20 Dec - 04 Jan	Air Canada
27 Dec - 03 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 512€

Return flights