VA 8576 then VS 20 at San Francisco
Las Vegas → San Francisco → London
Timetable, San Francisco time
19:03VA 8576 from Las Vegas at the gate
16:40VS 20 to London leaves the gatealso NZ 4162, KL 4813, SV 4830, DL 5964, AF 9650
21 h 37 apart on the timetable, overnight
VS 20 leaves 21 h 37 after VA 8576 arrives on the timetable: more than half a day, so not a connection we count.