Cheapest return flights from Keflavik to Lisbon in December from $394

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

Return flights

30 Dec - 06 Jan easyJet
31 Dec - 04 Jan easyJet
30 Dec - 01 Jan easyJet
29 Dec - 05 Jan easyJet
28 Dec - 04 Jan Scandinavian Airlines
28 Dec - 01 Jan Wizz Air
30 Dec - 02 Jan easyJet
27 Dec - 03 Jan Transavia France
28 Dec - 01 Jan Icelandair direct
28 Dec - 04 Jan Icelandair direct

Also check the deals for one-way flights from Keflavik to Lisbon in December.

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