UA 638 then UA 2127 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
05:50UA 2127 to Los Angeles leaves the gatealso AV 2163, NZ 9260
14 h 15 apart on the timetable, overnight
UA 2127 leaves 14 h 15 after UA 638 arrives on the timetable: more than half a day, so not a connection we count.