A3 367 then GQ 670 at Athens
Santorini → Athens → Istanbul
Timetable, Athens time
15:35A3 367 from Santorini at the gate
06:55GQ 670 to Istanbul leaves the gate
15 h 20 apart on the timetable, overnight
GQ 670 leaves 15 h 20 after A3 367 arrives on the timetable: more than half a day, so not a connection we count.