UA 271 then VA 8562 at San Francisco
Washington → San Francisco → Las Vegas
Timetable, San Francisco time
12:32UA 271 from Washington at the gatealso NZ 9180, MS 9321
08:35VA 8562 to Las Vegas leaves the gate
20 h 03 apart on the timetable, overnight
VA 8562 leaves 20 h 03 after UA 271 arrives on the timetable: more than half a day, so not a connection we count.