For the cheapest flights to Sofia book 60 days before departure.
The most popular airlines on the route Vienna - Sofia: Bulgaria Air (FB), Austrian (OS), Air Berlin (AB).
The cheapest flights are on the route Schwechat (VIE) - Sofia Airport (SOF).
Direct flights last about 1h 26min.
Direct flights are available 7 days a week.
Direct flights: Bulgaria Air (FB), Air Berlin (AB), Austrian (OS).