UA 573 then WN 1650 at Denver
San Francisco → Denver → Houston Hobby
Timetable, Denver time
23:59UA 573 from San Francisco at the gate
12:00WN 1650 to Houston Hobby leaves the gate
12 h 01 apart on the timetable, overnight
WN 1650 leaves 12 h 01 after UA 573 arrives on the timetable: more than half a day, so not a connection we count.