WN 191 then UA 5401 at San Francisco
St Louis → San Francisco → Phoenix
Timetable, San Francisco time
12:25WN 191 from St Louis at the gate
12:00UA 5401 to Phoenix leaves the gatealso NZ 9375
23 h 35 apart on the timetable, overnight
UA 5401 leaves 23 h 35 after WN 191 arrives on the timetable: more than half a day, so not a connection we count.