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

Return flights

07 Aug - 27 Aug	TAP
14 Aug - 22 Aug	TAP
13 Aug - 19 Aug	Icelandair
21 Aug - 29 Aug	TAP
11 Aug - 21 Aug	Air Canada
13 Aug - 20 Aug	Aer Lingus	direct
11 Aug - 20 Aug	Aer Lingus	direct
10 Aug - 19 Aug	Aer Lingus	direct
13 Aug - 26 Aug	Air Canada
11 Aug - 21 Aug	Finnair	direct
01 Aug - 30 Sep	TAP
30 Aug - 14 Sep	TAP
29 Aug - 05 Sep	TAP
26 Aug - 02 Sep	Aer Lingus	direct
13 Aug - 07 Sep	Air Canada
13 Aug - 07 Sep	Aer Lingus	direct
28 Aug - 04 Sep	Icelandair
28 Aug - 04 Sep	Aer Lingus	direct
29 Aug - 05 Sep	Aer Lingus	direct
30 Aug - 06 Sep	Icelandair

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 $478

Return flights