JU 310 then FR 45 at Vienna
Belgrade → Vienna → Athens
Timetable, Vienna time
09:15JU 310 from Belgrade at the gate
07:50FR 45 to Athens leaves the gate
22 h 35 apart on the timetable, overnight
FR 45 leaves 22 h 35 after JU 310 arrives on the timetable: more than half a day, so not a connection we count.