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

Return flights

04 Dec - 07 Dec	easyJet
08 Dec - 10 Dec	easyJet
14 Dec - 16 Dec	easyJet
28 Dec - 04 Jan	easyJet
27 Dec - 03 Jan	easyJet
31 Dec - 13 Jan	Icelandair	direct
19 Dec - 03 Jan	easyJet
28 Dec - 04 Jan	Icelandair	direct
04 Dec - 07 Dec	Icelandair	direct
08 Dec - 10 Dec	Icelandair	direct
27 Dec - 03 Jan	Icelandair	direct
19 Dec - 03 Jan	Icelandair	direct

Also check the deals for one-way flights from Keflavik 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 Keflavik to Dublin in December from 151€

Return flights