UA 4500 then EI 116 at Dulles
Detroit → Washington → Dublin
Timetable, Washington time
21:17UA 4500 from Detroit at the gate
17:15EI 116 to Dublin leaves the gate
19 h 58 apart on the timetable, overnight
EI 116 leaves 19 h 58 after UA 4500 arrives on the timetable: more than half a day, so not a connection we count.