UA 6013 then UA 3755 at Houston
Grand Rapids → Houston → Lubbock
Timetable, Houston time
08:35UA 6013 from Grand Rapids at the gate
22:10UA 3755 to Lubbock leaves the gate
13 h 35 apart on the timetable
UA 3755 leaves 13 h 35 after UA 6013 arrives on the timetable: more than half a day, so not a connection we count.