OS 770 then FR 182 at Vienna
Varna → Vienna → Sofia
Timetable, Vienna time
16:50OS 770 from Varna at the gate
11:40FR 182 to Sofia leaves the gate
18 h 50 apart on the timetable, overnight
FR 182 leaves 18 h 50 after OS 770 arrives on the timetable: more than half a day, so not a connection we count.