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

One-Way flights

15 Aug	Porter Airlines (Canada) Ltd
25 Aug	Porter Airlines (Canada) Ltd
19 Aug	Porter Airlines (Canada) Ltd
23 Aug	Porter Airlines (Canada) Ltd
31 Aug	Porter Airlines (Canada) Ltd
20 Aug	Porter Airlines (Canada) Ltd
17 Aug	Porter Airlines (Canada) Ltd
09 Aug	Frontier Airlines
01 Aug	Frontier Airlines
22 Aug	Frontier Airlines

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 224€

One-Way flights