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

Return flights

08 Dec - 13 Dec	easyJet
10 Dec - 13 Dec	Transavia France
08 Dec - 14 Dec	easyJet
01 Dec - 06 Dec	easyJet
01 Dec - 09 Dec	easyJet
07 Dec - 10 Dec	easyJet
01 Dec - 05 Dec	easyJet
07 Dec - 11 Dec	easyJet
08 Dec - 15 Dec	easyJet
05 Dec - 08 Dec	Ryanair
30 Dec - 06 Jan	Ryanair
31 Dec - 05 Jan	easyJet
15 Dec - 02 Jan	Ryanair
25 Dec - 01 Jan	KLM
30 Dec - 05 Jan	Ryanair
27 Dec - 03 Jan	Ryanair
29 Dec - 05 Jan	Ryanair
25 Dec - 02 Jan	KLM
22 Dec - 02 Jan	Ryanair
29 Dec - 02 Jan	Lufthansa

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 186€

Return flights