GQ 421 then A3 712 at Athens
Zakynthos → Athens → Barcelona
Timetable, Athens time
17:45GQ 421 from Zakynthos at the gate
16:40A3 712 to Barcelona leaves the gate
22 h 55 apart on the timetable, overnight
A3 712 leaves 22 h 55 after GQ 421 arrives on the timetable: more than half a day, so not a connection we count.