UA 4301 then UA 2830 at Houston
Lubbock → Houston → Dallas-Fort Worth
Timetable, Houston time
18:41UA 4301 from Lubbock at the gate
16:20UA 2830 to Dallas-Fort Worth leaves the gate
21 h 39 apart on the timetable, overnight
UA 2830 leaves 21 h 39 after UA 4301 arrives on the timetable: more than half a day, so not a connection we count.