UA 1128 then AV 583 at Dulles
Chicago O'Hare → Washington → Santa Clara
Timetable, Washington time
16:32UA 1128 from Chicago O'Hare at the gate
16:25AV 583 to Santa Clara leaves the gate
23 h 53 apart on the timetable, overnight
AV 583 leaves 23 h 53 after UA 1128 arrives on the timetable: more than half a day, so not a connection we count.