UA 5191 then UA 534 at Houston
Oklahoma City → Houston → Denver
Timetable, Houston time
09:30UA 5191 from Oklahoma City at the gate
08:30UA 534 to Denver leaves the gate
23 h apart on the timetable, overnight
UA 534 leaves 23 h after UA 5191 arrives on the timetable: more than half a day, so not a connection we count.