UA 4258 then LX 73 at Dulles
Cincinnati → Washington → Zurich
Timetable, Washington time
21:22UA 4258 from Cincinnati at the gate
20:10LX 73 to Zurich leaves the gate
22 h 48 apart on the timetable, overnight
LX 73 leaves 22 h 48 after UA 4258 arrives on the timetable: more than half a day, so not a connection we count.