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

Return flights

20 Aug - 27 Aug	Porter Airlines (Canada) Ltd
13 Aug - 27 Aug	Air Canada
29 Aug - 02 Sep	Porter Airlines (Canada) Ltd
28 Aug - 02 Sep	Lufthansa
26 Aug - 02 Sep	Lufthansa
13 Aug - 22 Aug	Air Canada
24 Aug - 31 Aug	Air Canada
28 Aug - 01 Sep	Air Canada
18 Aug - 25 Aug	WestJet
11 Aug - 25 Aug	WestJet

Also check the deals for one-way flights from Ottawa 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 Ottawa to Dublin in August from 516€

Return flights