UA 1486 then TK 188 at Dulles
Chicago O'Hare → Washington → Istanbul
Timetable, Washington time
13:35UA 1486 from Chicago O'Hare at the gate
13:30TK 188 to Istanbul leaves the gate
23 h 55 apart on the timetable, overnight
TK 188 leaves 23 h 55 after UA 1486 arrives on the timetable: more than half a day, so not a connection we count.