UA 4301 then UA 5142 at Houston
Lubbock → Houston → Tucson
Timetable, Houston time
18:41UA 4301 from Lubbock at the gate
11:30UA 5142 to Tucson leaves the gate
16 h 49 apart on the timetable, overnight
UA 5142 leaves 16 h 49 after UA 4301 arrives on the timetable: more than half a day, so not a connection we count.