UA 4456 then UA 6338 at Houston
Baton Rouge → Houston → Monterrey
Timetable, Houston time
06:21UA 4456 from Baton Rouge at the gate
18:42UA 6338 to Monterrey leaves the gate
12 h 21 apart on the timetable
UA 6338 leaves 12 h 21 after UA 4456 arrives on the timetable: more than half a day, so not a connection we count.