UA 4301 then UA 311 at Houston
Lubbock → Houston → Philadelphia
Timetable, Houston time
18:41UA 4301 from Lubbock at the gate
18:36UA 311 to Philadelphia leaves the gate
23 h 55 apart on the timetable, overnight
UA 311 leaves 23 h 55 after UA 4301 arrives on the timetable: more than half a day, so not a connection we count.