WN 3525 then UA 489 at Denver
Chicago Midway → Denver → Houston
Timetable, Denver time
20:20WN 3525 from Chicago Midway at the gate
15:35UA 489 to Houston leaves the gate
19 h 15 apart on the timetable, overnight
UA 489 leaves 19 h 15 after WN 3525 arrives on the timetable: more than half a day, so not a connection we count.