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

Return flights

25 Dec - 11 Jan	Delta
23 Dec - 06 Jan	Delta
12 Dec - 11 Jan	Delta
18 Dec - 23 Dec	Delta
27 Dec - 03 Jan	KLM
18 Dec - 27 Dec	Delta
13 Dec - 28 Dec	KLM
14 Dec - 19 Dec	Southwest Airlines
12 Dec - 28 Dec	KLM
28 Dec - 04 Jan	Delta
27 Dec - 04 Jan	Delta
22 Dec - 02 Jan	Delta
20 Dec - 03 Jan	KLM
19 Dec - 31 Dec	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 649€

Return flights