AM 455 then UA 3752 at Dulles
Mexico City → Washington → Oklahoma City
Timetable, Washington time
14:11AM 455 from Mexico City at the gate
09:40UA 3752 to Oklahoma City leaves the gate
19 h 29 apart on the timetable, overnight
UA 3752 leaves 19 h 29 after AM 455 arrives on the timetable: more than half a day, so not a connection we count.