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

Return flights

11 Dec - 18 Dec	Ryanair
11 Dec - 17 Dec	Ryanair
24 Dec - 25 Dec	Ryanair
11 Dec - 12 Dec	Ryanair
13 Dec - 08 Jan	Ryanair
08 Dec - 15 Dec	Scandinavian Airlines
10 Dec - 17 Dec	Ryanair
25 Dec - 31 Dec	Norwegian Air Sweden AOC
30 Dec - 08 Jan	Norwegian Air Sweden AOC
08 Dec - 12 Dec	airBaltic
24 Dec - 27 Dec	Ryanair
19 Dec - 09 Jan	Ryanair
09 Dec - 13 Dec	Finnair
27 Dec - 01 Jan	Eurowings
22 Dec - 04 Jan	Norwegian Air Sweden AOC
20 Dec - 05 Jan	Finnair
27 Dec - 02 Jan	Eurowings
20 Dec - 04 Jan	Finnair

Also check the deals for one-way flights from Helsinki 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 Helsinki to Sofia in December from $147

Return flights