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

Return flights

13 Oct - 08 Nov	Iberia
20 Oct - 15 Nov	Iberia
15 Oct - 08 Nov	Iberia
14 Oct - 08 Nov	Iberia
24 Oct - 02 Nov	Iberia
23 Oct - 01 Nov	Iberia
01 Oct - 04 Oct	jetBlue
06 Oct - 01 Nov	Iberia
23 Oct - 03 Nov	Iberia
14 Oct - 26 Oct	Iberia
08 Oct - 17 Oct	Iberia
10 Oct - 14 Oct	Iberia
06 Oct - 15 Oct	Iberia
10 Oct - 27 Oct	Iberia
01 Oct - 12 Oct	Iberia
03 Oct - 13 Oct	Iberia
05 Oct - 18 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 499€

Return flights