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

Return flights

10 Dec - 13 Dec	Ryanair
14 Dec - 17 Dec	Wizz Air
31 Dec - 06 Jan	Ryanair
31 Dec - 07 Jan	Wizz Air
09 Dec - 11 Dec	Ryanair
17 Dec - 03 Jan	Ryanair
18 Dec - 23 Dec	Ryanair
31 Dec - 03 Jan	Ryanair
20 Dec - 23 Dec	Ryanair
23 Dec - 02 Jan	Ryanair
19 Dec - 22 Dec	Ryanair
25 Dec - 30 Dec	Transavia France
28 Dec - 07 Jan	Wizz Air
30 Dec - 06 Jan	Ryanair
21 Dec - 24 Dec	Wizz Air
19 Dec - 23 Dec	Ryanair
26 Dec - 31 Dec	Scandinavian Airlines
23 Dec - 03 Jan	Ryanair
22 Dec - 02 Jan	Ryanair
25 Dec - 05 Jan	Transavia France

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 $312

Return flights