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

Return flights

25 Aug - 03 Sep	KLM
24 Aug - 02 Sep	KLM
26 Aug - 03 Sep	Delta
26 Aug - 02 Sep	Delta
27 Aug - 05 Sep	Porter Airlines (Canada) Ltd
18 Aug - 26 Aug	Delta
12 Aug - 21 Aug	Air France
13 Aug - 21 Aug	Air France
21 Aug - 30 Aug	Porter Airlines (Canada) Ltd
14 Aug - 21 Aug	Air France
21 Aug - 26 Aug	Delta
14 Aug - 28 Aug	Air France
27 Aug - 01 Sep	Porter Airlines (Canada) Ltd
21 Aug - 25 Aug	Delta
19 Aug - 06 Sep	Delta
07 Aug - 14 Aug	Air France
06 Aug - 13 Aug	Air France
28 Aug - 06 Sep	Delta
30 Aug - 14 Sep	Porter Airlines (Canada) Ltd
30 Aug - 06 Sep	Delta

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 515€

Return flights