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

Return flights

28 Dec - 06 Jan	Wizz Air
30 Dec - 06 Jan	Ryanair
28 Dec - 07 Jan	Wizz Air
31 Dec - 07 Jan	Wizz Air
28 Dec - 05 Jan	Wizz Air
28 Dec - 04 Jan	Wizz Air
28 Dec - 02 Jan	Wizz Air
29 Dec - 05 Jan	Scandinavian Airlines
28 Dec - 03 Jan	Wizz Air
31 Dec - 04 Jan	Ryanair
27 Dec - 30 Dec	Ryanair

Also check the deals for one-way flights from Porto 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 Porto to Keflavik in December from 333€

Return flights