Currently there are no direct flights Sofia to Costa Rica.

Flights Sofia to Costa Rica with 1 stopover:

Flights via LHR, Heathrow, LHR, London, United Kingdom
From Sofia (SOF), Bulgaria with British Airways Transfer at London Heathrow (LHR) Then on to Juan Santamaria International Airport (SJO), San Jose, Costa Rica with BWIA International Airways
OR
Then on to Juan Santamaria International Airport (SJO), San Jose, Costa Rica with British Airways