TK 400 then GQ 671 at Istanbul
St. Petersburg → Istanbul → Athens
Timetable, Istanbul time
04:45TK 400 from St. Petersburg at the gate
22:45GQ 671 to Athens leaves the gate
18 h apart on the timetable
GQ 671 leaves 18 h after TK 400 arrives on the timetable: more than half a day, so not a connection we count.