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

Return flights

12 Dec - 16 Dec	Ryanair
21 Dec - 31 Dec	easyJet
11 Dec - 15 Dec	easyJet
12 Dec - 15 Dec	easyJet
05 Dec - 08 Dec	Ryanair
19 Dec - 24 Dec	Ryanair
23 Dec - 30 Dec	Ryanair
19 Dec - 22 Dec	Ryanair
24 Dec - 30 Dec	Ryanair
23 Dec - 29 Dec	Ryanair
31 Dec - 03 Jan	Ryanair
26 Dec - 05 Jan	Aeroitalia
27 Dec - 05 Jan	Aeroitalia
29 Dec - 03 Jan	Ryanair
27 Dec - 03 Jan	Ryanair

Also check the deals for one-way flights from Cagliari 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 Cagliari to Keflavik in December from 172€

Return flights