UA 643 then SK 3961 at San Francisco
Las Vegas → San Francisco → Los Angeles
Timetable, San Francisco time
07:44UA 643 from Las Vegas at the gatealso AC 5211, NH 7315, VA 8122, NZ 9237
20:50SK 3961 to Los Angeles leaves the gate
13 h 06 apart on the timetable
SK 3961 leaves 13 h 06 after UA 643 arrives on the timetable: more than half a day, so not a connection we count.