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

Return flights

01 Dec - 08 Dec	British Airways
10 Dec - 17 Dec	Lufthansa
29 Dec - 24 Jan	Air Canada
16 Dec - 05 Jan	British Airways
08 Dec - 15 Dec	Icelandair
05 Dec - 13 Dec	Icelandair
01 Dec - 27 Dec	Air Canada
22 Dec - 17 Jan	Air Canada
13 Dec - 20 Dec	jetBlue
08 Dec - 03 Jan	KLM
13 Dec - 03 Jan	KLM
23 Dec - 30 Dec	Aer Lingus
28 Dec - 04 Jan	Icelandair
20 Dec - 03 Jan	Air France
20 Dec - 02 Jan	Delta

Also check the deals for one-way flights from Denver 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 Denver to Dublin in December from $442

Return flights