UA 638 then NH 7306 at San Francisco
Chicago O'Hare → San Francisco → Phoenix
Timetable, San Francisco time
15:35UA 638 from Chicago O'Hare at the gatealso AC 4116
12:00NH 7306 to Phoenix leaves the gatealso CA 7333
20 h 25 apart on the timetable, overnight
NH 7306 leaves 20 h 25 after UA 638 arrives on the timetable: more than half a day, so not a connection we count.