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

Return flights

17 Oct - 24 Oct	jetBlue
19 Oct - 08 Nov	Iberia
13 Oct - 08 Nov	Iberia
15 Oct - 08 Nov	Iberia
21 Oct - 15 Nov	Iberia
22 Oct - 15 Nov	Iberia
20 Oct - 15 Nov	Iberia
15 Oct - 22 Oct	jetBlue
16 Oct - 23 Oct	jetBlue
17 Oct - 22 Oct	Iberia
06 Oct - 01 Nov	Iberia
12 Oct - 20 Oct	Iberia
18 Oct - 25 Oct	jetBlue
04 Oct - 06 Oct	Iberia
04 Oct - 07 Oct	Iberia
20 Oct - 27 Oct	Iberia
15 Oct - 25 Oct	Iberia

Also check the deals for one-way flights from Ontario 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 Ontario to Dublin in October from 574€

Return flights