UA 5191 then VB 611 at Houston
Oklahoma City → Houston → Monterrey
Timetable, Houston time
09:30UA 5191 from Oklahoma City at the gate
08:50VB 611 to Monterrey leaves the gate
23 h 20 apart on the timetable, overnight
VB 611 leaves 23 h 20 after UA 5191 arrives on the timetable: more than half a day, so not a connection we count.