UA 2106 then UA 1389 at San Francisco
Chicago O'Hare → San Francisco → San Diego
Timetable, San Francisco time
00:53UA 2106 from Chicago O'Hare at the gatealso AC 4373, VA 8090, LH 8778, NZ 9329
22:42UA 1389 to San Diego leaves the gatealso CM 2511, AC 4292, VA 8426, LH 9372, NZ 9584
21 h 49 apart on the timetable
UA 1389 leaves 21 h 49 after UA 2106 arrives on the timetable: more than half a day, so not a connection we count.