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

Return flights

02 Dec - 09 Dec	Ryanair
13 Dec - 28 Dec	Wizz Air
15 Dec - 28 Dec	Ryanair
09 Dec - 15 Dec	Wizz Air
08 Dec - 15 Dec	Ryanair
22 Dec - 30 Dec	Ryanair
21 Dec - 05 Jan	Ryanair
11 Dec - 21 Dec	Ryanair
13 Dec - 27 Dec	Wizz Air
11 Dec - 27 Dec	Ryanair
14 Dec - 27 Dec	Wizz Air
26 Dec - 01 Jan	Ryanair
23 Dec - 02 Jan	Ryanair
27 Dec - 01 Jan	Wizz Air
25 Dec - 01 Jan	LOT
30 Dec - 04 Jan	Ryanair
25 Dec - 03 Jan	Wizz Air
27 Dec - 02 Jan	LOT
26 Dec - 02 Jan	Ryanair

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 $236

Return flights