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

Return flights

11 Dec - 14 Dec	Ryanair
05 Dec - 18 Dec	Ryanair
10 Dec - 14 Dec	Ryanair
09 Dec - 18 Dec	Lufthansa
19 Dec - 02 Jan	airBaltic
19 Dec - 05 Jan	airBaltic
22 Dec - 05 Jan	airBaltic
24 Dec - 28 Dec	Ryanair
20 Dec - 24 Dec	Ryanair
22 Dec - 29 Dec	airBaltic
22 Dec - 06 Jan	airBaltic
20 Dec - 23 Dec	Ryanair
23 Dec - 28 Dec	Ryanair
23 Dec - 27 Dec	Ryanair
20 Dec - 05 Jan	Ryanair

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 168€

Return flights