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

Return flights

05 Dec - 14 Dec	Iberia
04 Dec - 08 Dec	Iberia
07 Dec - 27 Dec	Iberia
06 Dec - 27 Dec	Iberia
12 Dec - 21 Dec	Iberia
26 Dec - 07 Jan	Iberia
28 Dec - 05 Jan	Iberia
29 Dec - 07 Jan	Iberia
14 Dec - 06 Jan	Iberia
23 Dec - 30 Dec	Iberia
25 Dec - 06 Jan	Iberia
28 Dec - 06 Jan	Iberia
22 Dec - 07 Jan	Iberia
03 Dec - 15 Dec	Alaska Airlines
17 Dec - 08 Jan	British Airways
22 Dec - 27 Dec	Iberia
22 Dec - 30 Dec	Iberia
23 Dec - 28 Dec	Iberia
21 Dec - 06 Jan	Iberia
14 Dec - 02 Jan	Iberia

Also check the deals for one-way flights from Ontario 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 Ontario to Dublin in December from $652

Return flights