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

Return flights

09 Dec - 12 Dec	Icelandair
06 Dec - 13 Dec	Icelandair
06 Dec - 16 Dec	Delta
28 Dec - 08 Jan	British Airways
16 Dec - 08 Jan	Air Canada
15 Dec - 31 Dec	Delta
08 Dec - 15 Dec	United
16 Dec - 06 Jan	Air Canada
27 Dec - 09 Jan	United
05 Dec - 19 Dec	United
15 Dec - 30 Dec	Air Canada
13 Dec - 20 Dec	Icelandair
17 Dec - 07 Jan	United
18 Dec - 08 Jan	KLM
13 Dec - 02 Jan	Delta
23 Dec - 30 Dec	United

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 324€

Return flights