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

Return flights

08 Dec - 12 Dec	easyJet
08 Dec - 13 Dec	easyJet
23 Dec - 28 Dec	easyJet
31 Dec - 04 Jan	Ryanair
19 Dec - 26 Dec	Lufthansa
29 Dec - 02 Jan	Air Serbia
30 Dec - 04 Jan	easyJet
30 Dec - 03 Jan	easyJet
19 Dec - 27 Dec	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 200€

Return flights