The cheapest flight to Stockholm you can get by boooking 50 days before departure.
The most popular airlines on the route Sofia - Stockholm: Ryanair (FR), Lufthansa (LH), Air Berlin (AB).
The cheapest flights you can book on the route Sofia Airport (SOF) - Skavsta (NYO).
Direct flights last about 2h 50min.
Direct flights available 2 days a week - Wednesday, Sunday.
Direct flights: Ryanair (FR).