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

Return flights

02 Dec - 09 Dec	Icelandair
05 Dec - 12 Dec	Icelandair
04 Dec - 11 Dec	Icelandair
05 Dec - 13 Dec	Icelandair
01 Dec - 08 Dec	Icelandair
10 Dec - 17 Dec	United
29 Dec - 24 Jan	British Airways
08 Dec - 15 Dec	Icelandair
15 Dec - 10 Jan	United
13 Dec - 20 Dec	Icelandair
01 Dec - 27 Dec	British Airways
11 Dec - 18 Dec	Icelandair
25 Dec - 05 Jan	Lufthansa
22 Dec - 17 Jan	Icelandair
29 Dec - 04 Jan	British Airways
08 Dec - 03 Jan	KLM
29 Dec - 05 Jan	Aer Lingus
25 Dec - 01 Jan	jetBlue
23 Dec - 01 Jan	Aer Lingus
20 Dec - 03 Jan	Icelandair

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 353€

Return flights