IB 361 then UA 3752 at Dulles
Madrid → Washington → Oklahoma City
Timetable, Washington time
16:20IB 361 from Madrid at the gate
09:40UA 3752 to Oklahoma City leaves the gate
17 h 20 apart on the timetable, overnight
UA 3752 leaves 17 h 20 after IB 361 arrives on the timetable: more than half a day, so not a connection we count.