UA 561 then VA 8562 at San Francisco
Kansas City → San Francisco → Las Vegas
Timetable, San Francisco time
20:10UA 561 from Kansas City at the gatealso NZ 9502
14:20VA 8562 to Las Vegas leaves the gate
18 h 10 apart on the timetable, overnight
VA 8562 leaves 18 h 10 after UA 561 arrives on the timetable: more than half a day, so not a connection we count.