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

Return flights

06 Aug - 20 Aug	Iberia
13 Aug - 20 Aug	Iberia
12 Aug - 21 Aug	Iberia
04 Aug - 20 Aug	Iberia
11 Aug - 18 Aug	Iberia
25 Aug - 10 Sep	Iberia
24 Aug - 04 Sep	Iberia
23 Aug - 26 Sep	Iberia
01 Aug - 15 Aug	Iberia
30 Aug - 10 Sep	Iberia
08 Aug - 16 Aug	Iberia
28 Aug - 04 Sep	Iberia
08 Aug - 31 Aug	jetBlue
01 Aug - 01 Sep	Iberia
27 Aug - 12 Sep	Iberia
09 Aug - 17 Aug	Iberia
14 Aug - 20 Aug	Iberia
28 Aug - 01 Sep	Iberia
30 Aug - 06 Sep	Iberia
29 Aug - 04 Sep	Iberia

Also check the deals for one-way flights from Ontario to Dublin in August.

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 August from $487

Return flights