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

Return flights

08 Aug - 11 Sep	Norwegian Air Sweden AOC
31 Aug - 30 Sep	Ryanair
01 Aug - 31 Aug	Norwegian Air Sweden AOC
04 Aug - 11 Aug	Norwegian Air Sweden AOC
08 Aug - 14 Aug	Norwegian Air Sweden AOC
22 Aug - 28 Aug	Ryanair
08 Aug - 15 Aug	Norwegian Air Sweden AOC
04 Aug - 08 Aug	Norwegian Air Sweden AOC	direct
29 Aug - 01 Sep	Pegasus Airlines
15 Aug - 21 Aug	Ryanair
24 Aug - 28 Aug	Ryanair
20 Aug - 24 Aug	Norwegian Air Sweden AOC
10 Aug - 14 Aug	Ryanair

Also check the deals for one-way flights from Helsinki to Sofia in August.

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 August from 148€

Return flights