DL 541 then UA 4897 at Dulles
Seattle → Washington → Roanoke
Timetable, Washington time
00:20DL 541 from Seattle at the gate
22:25UA 4897 to Roanoke leaves the gate
22 h 05 apart on the timetable
UA 4897 leaves 22 h 05 after DL 541 arrives on the timetable: more than half a day, so not a connection we count.