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

Return flights

08 Dec - 16 Dec	Delta
09 Dec - 16 Dec	Delta
10 Dec - 24 Dec	Delta
13 Dec - 22 Dec	Air France
12 Dec - 11 Jan	Frontier Airlines
04 Dec - 11 Dec	KLM
07 Dec - 14 Dec	Air France
17 Dec - 24 Dec	KLM
30 Dec - 06 Jan	Delta
25 Dec - 13 Jan	Delta
31 Dec - 10 Jan	Delta
23 Dec - 30 Dec	Delta
07 Dec - 17 Dec	Frontier Airlines
23 Dec - 28 Dec	Delta
23 Dec - 06 Jan	Delta
12 Dec - 10 Jan	Delta
21 Dec - 13 Jan	Frontier Airlines
16 Dec - 01 Jan	Air France
20 Dec - 04 Jan	Frontier Airlines
22 Dec - 07 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 $432

Return flights