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

Return flights

14 Oct - 21 Oct	jetBlue
13 Oct - 08 Nov	Iberia
20 Oct - 15 Nov	Iberia
15 Oct - 08 Nov	Iberia
17 Oct - 02 Nov	Iberia
16 Oct - 02 Nov	Iberia
06 Oct - 01 Nov	Iberia
08 Oct - 01 Nov	Iberia
01 Oct - 15 Oct	jetBlue
01 Oct - 08 Oct	Iberia
05 Oct - 25 Oct	jetBlue
10 Oct - 24 Oct	Iberia
14 Oct - 26 Oct	Iberia
02 Oct - 06 Oct	Iberia
23 Oct - 29 Oct	jetBlue
27 Oct - 22 Nov	KLM
22 Oct - 29 Oct	jetBlue
03 Oct - 09 Oct	KLM

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.

Book a cheap hotel in Dublin

Cheap car rent in Dublin

Cheapest return flights from Ontario to Dublin in October from $664

Return flights