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

Return flights

25 Aug - 28 Aug	Frontier Airlines
17 Aug - 26 Aug	Delta
18 Aug - 26 Aug	Air France
26 Aug - 03 Sep	Delta
22 Aug - 29 Aug	KLM
29 Aug - 06 Sep	Frontier Airlines
31 Aug - 20 Sep	Air France
20 Aug - 27 Aug	Delta
18 Aug - 24 Aug	Frontier Airlines
30 Aug - 14 Sep	Frontier Airlines
21 Aug - 28 Aug	Frontier Airlines
22 Aug - 31 Aug	KLM
27 Aug - 31 Aug	Delta
17 Aug - 06 Sep	KLM
29 Aug - 01 Sep	Frontier Airlines
21 Aug - 26 Aug	Air France

Also check the deals for one-way 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 return flights from Chicago to Dublin in August from 573€

Return flights