UA 229 then UA 3752 at Dulles
Dublin → Washington → Oklahoma City
Timetable, Washington time
15:20UA 229 from Dublin at the gate
09:40UA 3752 to Oklahoma City leaves the gate
18 h 20 apart on the timetable, overnight
UA 3752 leaves 18 h 20 after UA 229 arrives on the timetable: more than half a day, so not a connection we count.