UA 2016 then UA 3752 at Dulles
Portland (Oregon) → Washington → Oklahoma City
Timetable, Washington time
16:22UA 2016 from Portland (Oregon) at the gate
09:40UA 3752 to Oklahoma City leaves the gate
17 h 18 apart on the timetable, overnight
UA 3752 leaves 17 h 18 after UA 2016 arrives on the timetable: more than half a day, so not a connection we count.