UA 3911 then Y4 833 at Houston
Washington → Houston → Puebla
Timetable, Houston time
00:06UA 3911 from Washington at the gate
18:39Y4 833 to Puebla leaves the gate
18 h 33 apart on the timetable
Y4 833 leaves 18 h 33 after UA 3911 arrives on the timetable: more than half a day, so not a connection we count.