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

Return flights

02 Dec - 09 Dec	Air France
31 Dec - 13 Jan	Delta
01 Dec - 12 Dec	Delta
04 Dec - 09 Dec	KLM
05 Dec - 12 Dec	Delta
30 Dec - 11 Jan	Delta
10 Dec - 14 Dec	Delta
10 Dec - 18 Jan	KLM
31 Dec - 07 Jan	Delta
02 Dec - 27 Dec	Air France
28 Dec - 14 Jan	Delta
04 Dec - 10 Jan	Frontier Airlines
17 Dec - 24 Dec	KLM
04 Dec - 12 Dec	Frontier Airlines
14 Dec - 28 Dec	Delta
25 Dec - 30 Dec	Delta
23 Dec - 11 Jan	Delta
25 Dec - 01 Jan	Delta
23 Dec - 17 Jan	Air France
22 Dec - 11 Jan	Air France

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 374€

Return flights