UA 6331 then UA 296 at Houston
Norfolk → Houston → Denver
Timetable, Houston time
08:45UA 6331 from Norfolk at the gate
15:17UA 296 to Denver leaves the gate
6 h 32 apart on the timetable
The last days
UA 6331 and UA 296 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.