DL 541 then UA 4233 at Dulles
Seattle → Washington → Harrisburg
Timetable, Washington time
00:20DL 541 from Seattle at the gate
22:40UA 4233 to Harrisburg leaves the gate
22 h 20 apart on the timetable
UA 4233 leaves 22 h 20 after DL 541 arrives on the timetable: more than half a day, so not a connection we count.