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

One-Way flights

02 Dec	Scandinavian Airlines
06 Dec	Scandinavian Airlines
05 Dec	Scandinavian Airlines
20 Dec	Fly Play	direct
07 Dec	Aer Lingus
26 Dec	Fly Play	direct
06 Dec	Icelandair	direct
07 Dec	Icelandair	direct
05 Dec	World Ticket Ltd	direct
28 Dec	Aer Lingus

Also check the deals for return flights from Dublin to Keflavik 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 one-way flights from Dublin to Keflavik in December from $96

One-Way flights