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

Return flights

02 Dec - 17 Dec	Wizz Air
02 Dec - 09 Dec	Ryanair
06 Dec - 13 Dec	Ryanair
06 Dec - 12 Dec	Ryanair
02 Dec - 05 Dec	Wizz Air
29 Dec - 31 Jan	Wizz Air
26 Dec - 01 Jan	LOT
17 Dec - 10 Jan	Norwegian
25 Dec - 05 Jan	LOT
20 Dec - 30 Dec	Scandinavian Airlines
20 Dec - 04 Jan	Scandinavian Airlines
13 Dec - 03 Jan	Lufthansa

Also check the deals for one-way flights from Oslo to Sofia 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 Oslo to Sofia in December from $101

Return flights