UA 4258 then EI 116 at Dulles
Cincinnati Northern Kentucky → Washington → Dublin
Timetable, Washington time
21:22UA 4258 from Cincinnati Northern Kentucky at the gate
17:15EI 116 to Dublin leaves the gate
19 h 53 apart on the timetable, overnight
EI 116 leaves 19 h 53 after UA 4258 arrives on the timetable: more than half a day, so not a connection we count.