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
08 Dec - 12 Dec	easyJet
02 Dec - 06 Dec	easyJet
08 Dec - 14 Dec	easyJet
02 Dec - 11 Dec	easyJet
07 Dec - 12 Dec	easyJet
02 Dec - 10 Dec	easyJet
07 Dec - 10 Dec	easyJet
03 Dec - 06 Dec	Vueling Airlines
08 Dec - 15 Dec	easyJet
31 Dec - 03 Jan	Vueling Airlines
25 Dec - 01 Jan	KLM
26 Dec - 01 Jan	Scandinavian Airlines
30 Dec - 04 Jan	Ryanair
27 Dec - 03 Jan	Air Europa
29 Dec - 02 Jan	Air Serbia
26 Dec - 02 Jan	Scandinavian Airlines
26 Dec - 04 Jan	Scandinavian Airlines

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 144€

Return flights