UA 604 then UA 3755 at Houston
San Francisco → Houston → Lubbock
Timetable, Houston time
06:32UA 604 from San Francisco at the gate
22:10UA 3755 to Lubbock leaves the gate
15 h 38 apart on the timetable
UA 3755 leaves 15 h 38 after UA 604 arrives on the timetable: more than half a day, so not a connection we count.