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

Return flights

01 Dec - 05 Dec	Icelandair
02 Dec - 09 Dec	Icelandair
06 Dec - 10 Dec	Icelandair
04 Dec - 09 Dec	Icelandair
04 Dec - 11 Dec	Icelandair
01 Dec - 08 Dec	Lufthansa
02 Dec - 12 Dec	United
09 Dec - 16 Dec	Delta
02 Dec - 18 Dec	United
03 Dec - 16 Dec	United
17 Dec - 06 Jan	Delta
24 Dec - 05 Jan	United
30 Dec - 06 Jan	Icelandair
08 Dec - 03 Jan	Frontier Airlines
26 Dec - 01 Jan	Turkish Airlines
19 Dec - 10 Jan	Frontier Airlines
17 Dec - 05 Jan	United
18 Dec - 05 Jan	KLM
22 Dec - 03 Jan	Frontier Airlines
20 Dec - 03 Jan	Frontier Airlines

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 349€

Return flights