GQ 391 then FR 6028 at Athens
Thessaloniki → Athens → Valletta
Timetable, Athens time
08:25GQ 391 from Thessaloniki at the gate
21:45FR 6028 to Valletta leaves the gate
13 h 20 apart on the timetable
FR 6028 leaves 13 h 20 after GQ 391 arrives on the timetable: more than half a day, so not a connection we count.