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

Return flights

07 Dec - 12 Dec	easyJet
02 Dec - 06 Dec	easyJet
01 Dec - 06 Dec	easyJet
01 Dec - 08 Dec	Ryanair
06 Dec - 09 Dec	easyJet
22 Dec - 29 Dec	easyJet
01 Dec - 07 Dec	Ryanair
04 Dec - 08 Dec	Ryanair
16 Dec - 20 Dec	easyJet
14 Dec - 18 Dec	easyJet
26 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.

Book a cheap hotel in Keflavik

Cheap car rent in Keflavik

Cheapest return flights from Porto to Keflavik in December from 150€

Return flights