UA 438 then UA 3755 at Houston
Georgetown (Guyana) → Houston → Lubbock
Timetable, Houston time
06:14UA 438 from Georgetown (Guyana) at the gate
22:10UA 3755 to Lubbock leaves the gate
15 h 56 apart on the timetable
UA 3755 leaves 15 h 56 after UA 438 arrives on the timetable: more than half a day, so not a connection we count.