Currently there are no direct flights Sofia to South Korea.

Flights Sofia to South Korea with 1 stopover:

Flights via Moscow Sheremetievo (SVO), Moscow, Russia
From Sofia (SOF), Bulgaria with Aeroflot
OR
From Sofia (SOF), Bulgaria with Aerosvit
Transfer at Moscow Sheremetievo (SVO), Moscow, Russia Then on to Incheon International Airport (ICN), Seoul, Republic of Korea (South Korea) with Aeroflot