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

Return flights

10 Dec - 18 Dec	Icelandair
10 Dec - 14 Dec	Icelandair
02 Dec - 09 Dec	Icelandair
01 Dec - 11 Dec	Icelandair
08 Dec - 16 Dec	Icelandair
03 Dec - 10 Dec	Icelandair
08 Dec - 14 Dec	Icelandair
09 Dec - 16 Dec	Icelandair
04 Dec - 16 Dec	Icelandair
02 Dec - 09 Dec	Aer Lingus	direct
31 Dec - 09 Jan	Icelandair
31 Dec - 08 Jan	Icelandair
29 Dec - 24 Jan	Icelandair
29 Dec - 24 Jan	Aer Lingus	direct
28 Dec - 11 Jan	Aer Lingus	direct
29 Dec - 11 Jan	Aer Lingus	direct
28 Dec - 09 Jan	Icelandair
12 Dec - 19 Jan	Aer Lingus	direct
12 Dec - 18 Jan	Aer Lingus	direct
26 Dec - 17 Jan	Air Canada

Also check the deals for one-way flights from Chicago to Dublin in December.

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 December from $351

Return flights