VS 21 then UA 3585 at Dulles
London → Washington → Indianapolis
Timetable, Washington time
17:40VS 21 from London at the gate
17:27UA 3585 to Indianapolis leaves the gate
23 h 47 apart on the timetable, overnight
UA 3585 leaves 23 h 47 after VS 21 arrives on the timetable: more than half a day, so not a connection we count.