UA 6258 then UA 3755 at Houston
Oklahoma City → Houston → Lubbock
Timetable, Houston time
06:39UA 6258 from Oklahoma City at the gate
22:10UA 3755 to Lubbock leaves the gate
15 h 31 apart on the timetable
UA 3755 leaves 15 h 31 after UA 6258 arrives on the timetable: more than half a day, so not a connection we count.