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

Return flights

28 Dec - 13 Jan	Aer Lingus	direct
27 Dec - 25 Jan	Lufthansa
29 Dec - 07 Jan	Lufthansa
27 Dec - 25 Jan	Lufthansa	direct
27 Dec - 08 Jan	Lufthansa	direct
29 Dec - 07 Jan	Aer Lingus	direct
28 Dec - 06 Jan	Lufthansa
29 Dec - 06 Jan	Icelandair
25 Dec - 29 Dec	Lufthansa
28 Dec - 09 Jan	Aer Lingus
24 Dec - 29 Dec	Lufthansa
29 Dec - 06 Jan	Brussels Airlines	direct
24 Dec - 27 Dec	Lufthansa
25 Dec - 31 Dec	Air France
25 Dec - 28 Dec	Lufthansa
26 Dec - 31 Dec	Frontier Airlines
25 Dec - 28 Dec	Aer Lingus	direct
26 Dec - 31 Dec	Lufthansa	direct
25 Dec - 31 Dec	Brussels Airlines	direct
25 Dec - 30 Dec	Brussels Airlines	direct

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 611€

Return flights