UA 1237 then QR 8187 at O'Hare
Minneapolis → Chicago → Houston
Timetable, Chicago time
20:21UA 1237 from Minneapolis at the gate
16:40QR 8187 to Houston leaves the gate
20 h 19 apart on the timetable, overnight
QR 8187 leaves 20 h 19 after UA 1237 arrives on the timetable: more than half a day, so not a connection we count.