DL 541 then UA 4252 at Dulles
Seattle → Washington → State College
Timetable, Washington time
00:20DL 541 from Seattle at the gate
22:10UA 4252 to State College leaves the gate
21 h 50 apart on the timetable
UA 4252 leaves 21 h 50 after DL 541 arrives on the timetable: more than half a day, so not a connection we count.