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

Return flights

08 Dec - 12 Dec	airBaltic
19 Dec - 09 Jan	airBaltic
12 Dec - 08 Jan	airBaltic
07 Dec - 08 Jan	airBaltic
19 Dec - 05 Jan	airBaltic
18 Dec - 08 Jan	Ryanair
22 Dec - 05 Jan	airBaltic
29 Dec - 02 Jan	airBaltic
19 Dec - 06 Jan	Ryanair
23 Dec - 06 Jan	Lufthansa

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.

Book a cheap hotel in Sofia

Cheap car rent in Sofia

Cheapest return flights from Helsinki to Sofia in December from $96

Return flights