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

Return flights

08 Dec - 11 Dec	easyJet
07 Dec - 11 Dec	easyJet
02 Dec - 06 Dec	easyJet
06 Dec - 09 Dec	easyJet
12 Dec - 15 Dec	easyJet
01 Dec - 05 Dec	Ryanair
06 Dec - 13 Dec	easyJet
05 Dec - 08 Dec	easyJet
25 Dec - 31 Dec	easyJet
26 Dec - 31 Dec	easyJet
26 Dec - 04 Jan	easyJet
26 Dec - 03 Jan	easyJet
28 Dec - 03 Jan	Wizz Air
30 Dec - 03 Jan	easyJet
28 Dec - 02 Jan	Wizz Air
29 Dec - 03 Jan	easyJet
27 Dec - 02 Jan	easyJet

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 149€

Return flights