DL 541 then UA 228 at Dulles
Seattle → Washington → Dublin
Timetable, Washington time
00:20DL 541 from Seattle at the gate
00:12UA 228 to Dublin leaves the gate
23 h 52 apart on the timetable, overnight
UA 228 leaves 23 h 52 after DL 541 arrives on the timetable: more than half a day, so not a connection we count.