H7 421 then TK 399 at Istanbul
Chişinău → Istanbul → St. Petersburg
Timetable, Istanbul time
22:30H7 421 from Chişinău at the gate
19:45TK 399 to St. Petersburg leaves the gate
21 h 15 apart on the timetable, overnight
TK 399 leaves 21 h 15 after H7 421 arrives on the timetable: more than half a day, so not a connection we count.