UA 261 then UA 3752 at Dulles
Madrid → Washington → Oklahoma City
Timetable, Washington time
14:00UA 261 from Madrid at the gate
09:40UA 3752 to Oklahoma City leaves the gate
19 h 40 apart on the timetable, overnight
UA 3752 leaves 19 h 40 after UA 261 arrives on the timetable: more than half a day, so not a connection we count.