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

Return flights

08 Dec - 10 Dec	Aer Lingus
11 Dec - 13 Dec	Ryanair
09 Dec - 16 Dec	Aer Lingus
01 Dec - 11 Dec	Ryanair
05 Dec - 09 Dec	Ryanair
01 Dec - 08 Dec	Aer Lingus
09 Dec - 15 Dec	Ryanair
04 Dec - 06 Dec	Aer Lingus
11 Dec - 16 Dec	Ryanair
02 Dec - 05 Dec	Ryanair
21 Dec - 06 Jan	Ryanair
30 Dec - 08 Jan	Ryanair
31 Dec - 05 Jan	Ryanair
31 Dec - 04 Jan	Ryanair
30 Dec - 01 Jan	Ryanair
21 Dec - 05 Jan	Ryanair
21 Dec - 06 Jan	Icelandair	direct
23 Dec - 05 Jan	Ryanair
13 Dec - 02 Jan	Ryanair
30 Dec - 04 Jan	Aer Lingus

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 177€

Return flights