VS 21 then UA 3632 at Dulles
London → Washington → Charleston (South Carolina)
Timetable, Washington time
17:40VS 21 from London at the gate
17:15UA 3632 to Charleston (South Carolina) leaves the gate
23 h 35 apart on the timetable, overnight
UA 3632 leaves 23 h 35 after VS 21 arrives on the timetable: more than half a day, so not a connection we count.