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

Return flights

12 Aug - 22 Aug	Iberia
11 Aug - 21 Aug	Iberia
10 Aug - 20 Aug	Iberia
04 Aug - 20 Aug	Iberia
18 Aug - 26 Aug	Delta
18 Aug - 02 Sep	Iberia
07 Aug - 14 Aug	Iberia
22 Aug - 17 Sep	Iberia
01 Aug - 16 Aug	Iberia
22 Aug - 28 Aug	Iberia
24 Aug - 02 Sep	jetBlue
13 Aug - 17 Aug	Iberia
24 Aug - 31 Aug	Iberia
03 Aug - 02 Sep	Iberia
29 Aug - 01 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 419€

Return flights