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

Return flights

13 Dec - 15 Dec	Ryanair
11 Dec - 15 Dec	Ryanair
07 Dec - 11 Dec	Ryanair
06 Dec - 11 Dec	Ryanair
21 Dec - 28 Dec	Wizz Air
22 Dec - 29 Dec	Ryanair
07 Dec - 08 Dec	Ryanair
06 Dec - 08 Dec	Ryanair
10 Dec - 17 Dec	Ryanair
07 Dec - 12 Dec	easyJet
17 Dec - 03 Jan	Ryanair
27 Dec - 01 Jan	Ryanair
29 Dec - 03 Jan	Ryanair
29 Dec - 05 Jan	Ryanair
27 Dec - 05 Jan	Ryanair
26 Dec - 05 Jan	Air Europa
27 Dec - 03 Jan	Ryanair
19 Dec - 02 Jan	SWISS
26 Dec - 04 Jan	Scandinavian Airlines
27 Dec - 04 Jan	Ryanair

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 258€

Return flights