AirHint found the following cheapest one-way flights from Chicago (MDW) to Dublin (DUB) in August 2025 (see full year).

One-Way flights

07 Aug	Frontier Airlines
08 Aug	Frontier Airlines
01 Aug	Frontier Airlines
14 Aug	Porter Airlines (Canada) Ltd
06 Aug	Porter Airlines (Canada) Ltd
24 Aug	Porter Airlines (Canada) Ltd
13 Aug	Porter Airlines (Canada) Ltd
17 Aug	Porter Airlines (Canada) Ltd
20 Aug	Porter Airlines (Canada) Ltd
22 Aug	Porter Airlines (Canada) Ltd

Also check the deals for return flights from Chicago 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 one-way flights from Chicago to Dublin in August from 255€

One-Way flights