DL 541 then UA 4304 at Dulles
Seattle → Washington → Knoxville
Timetable, Washington time
00:20DL 541 from Seattle at the gate
22:12UA 4304 to Knoxville leaves the gate
21 h 52 apart on the timetable
UA 4304 leaves 21 h 52 after DL 541 arrives on the timetable: more than half a day, so not a connection we count.