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

Return flights

04 Dec - 10 Dec	KLM
10 Dec - 17 Dec	KLM
28 Dec - 17 Jan	Air France
01 Dec - 12 Dec	Delta
28 Dec - 09 Jan	Delta
10 Dec - 18 Jan	Air France
06 Dec - 27 Dec	KLM
10 Dec - 22 Dec	Delta
09 Dec - 13 Dec	Frontier Airlines
11 Dec - 05 Jan	Frontier Airlines
27 Dec - 05 Jan	Delta
24 Dec - 31 Dec	Delta
25 Dec - 10 Jan	Delta
22 Dec - 17 Jan	Air France
17 Dec - 28 Dec	WestJet
19 Dec - 10 Jan	Frontier Airlines
26 Dec - 30 Dec	Delta
26 Dec - 31 Dec	Delta
13 Dec - 03 Jan	KLM
14 Dec - 03 Jan	KLM

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 416€

Return flights