UA 543 then UA 2127 at San Francisco
Chicago O'Hare → San Francisco → Los Angeles
Timetable, San Francisco time
13:30UA 543 from Chicago O'Hare at the gatealso AC 4163, VA 8089, NZ 9321
06:00UA 2127 to Los Angeles leaves the gatealso AV 2163, UA 3904, NZ 9260
16 h 30 apart on the timetable, overnight
UA 2127 leaves 16 h 30 after UA 543 arrives on the timetable: more than half a day, so not a connection we count.