WN 191 then UA 5621 at San Francisco
St Louis → San Francisco → Eugene
Timetable, San Francisco time
12:25WN 191 from St Louis at the gate
11:15UA 5621 to Eugene leaves the gate
22 h 50 apart on the timetable, overnight
UA 5621 leaves 22 h 50 after WN 191 arrives on the timetable: more than half a day, so not a connection we count.