UA 4301 then UA 4354 at Houston
Lubbock → Houston → Lubbock
Timetable, Houston time
18:41UA 4301 from Lubbock at the gate
12:05UA 4354 to Lubbock leaves the gate
17 h 24 apart on the timetable, overnight
UA 4354 leaves 17 h 24 after UA 4301 arrives on the timetable: more than half a day, so not a connection we count.