UA 638 then VA 8546 at San Francisco
Chicago O'Hare → San Francisco → Los Angeles
Timetable, San Francisco time
15:35UA 638 from Chicago O'Hare at the gatealso AC 4116
06:00VA 8546 to Los Angeles leaves the gate
14 h 25 apart on the timetable, overnight
VA 8546 leaves 14 h 25 after UA 638 arrives on the timetable: more than half a day, so not a connection we count.