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

Return flights

02 Dec - 11 Dec	easyJet
07 Dec - 11 Dec	Vueling Airlines
08 Dec - 11 Dec	Vueling Airlines
09 Dec - 15 Dec	easyJet
02 Dec - 09 Dec	easyJet
02 Dec - 05 Dec	easyJet
02 Dec - 10 Dec	easyJet
31 Dec - 07 Jan	Vueling Airlines
10 Dec - 15 Dec	Vueling Airlines
07 Dec - 13 Dec	Vueling Airlines
06 Dec - 10 Dec	Vueling Airlines
23 Dec - 04 Jan	easyJet

Also check the deals for one-way flights from Bilbao 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 Bilbao to Keflavik in December from $161

Return flights