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

Return flights

01 Dec - 09 Dec	Wizz Air
06 Dec - 09 Dec	Wizz Air
05 Dec - 09 Dec	Wizz Air
15 Dec - 20 Dec	Wizz Air
20 Dec - 28 Dec	LOT
23 Dec - 28 Dec	easyJet
22 Dec - 28 Dec	Wizz Air
30 Dec - 04 Jan	Wizz Air
23 Dec - 27 Dec	Ryanair
30 Dec - 03 Jan	Wizz Air
28 Dec - 03 Jan	easyJet

Also check the deals for one-way flights from Sofia 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 Sofia to Keflavik in December from 151€

Return flights