UA 3772 then VA 8381 at San Francisco
Las Vegas → San Francisco → Washington
Timetable, San Francisco time
22:05UA 3772 from Las Vegas at the gate
21:28VA 8381 to Washington leaves the gatealso NZ 9161
23 h 23 apart on the timetable, overnight
VA 8381 leaves 23 h 23 after UA 3772 arrives on the timetable: more than half a day, so not a connection we count.