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

Return flights

22 Dec - 06 Jan	Delta
18 Dec - 03 Jan	Delta
19 Dec - 27 Dec	Delta
20 Dec - 03 Jan	KLM
23 Dec - 29 Dec	Porter Airlines (Canada) Ltd
19 Dec - 03 Jan	Delta
19 Dec - 02 Jan	Delta
18 Dec - 04 Jan	Delta
20 Dec - 04 Jan	Delta

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 656€

Return flights