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

Return flights

08 Dec - 12 Dec	Aer Lingus
09 Dec - 13 Dec	Ryanair
11 Dec - 12 Dec	Ryanair
01 Dec - 04 Dec	Ryanair
10 Dec - 13 Dec	Aer Lingus
05 Dec - 11 Dec	Transavia France
03 Dec - 06 Dec	Vueling Airlines
08 Dec - 11 Dec	Ryanair
03 Dec - 09 Dec	Vueling Airlines
02 Dec - 09 Dec	Ryanair
31 Dec - 08 Jan	Ryanair
31 Dec - 07 Jan	Ryanair
23 Dec - 16 Jan	Ryanair
23 Dec - 16 Jan	Icelandair	direct
20 Dec - 04 Jan	Aer Lingus
31 Dec - 06 Jan	Ryanair
29 Dec - 09 Jan	Scandinavian Airlines
29 Dec - 07 Jan	Ryanair
20 Dec - 03 Jan	Aer Lingus
30 Dec - 01 Jan	Ryanair

Also check the deals for one-way 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 return flights from Dublin to Keflavik in December from $182

Return flights