UA 5191 then UA 3910 at Houston
Oklahoma City → Houston → Denver
Timetable, Houston time
09:30UA 5191 from Oklahoma City at the gate
15:00UA 3910 to Denver leaves the gate
5 h 30 apart on the timetable
The last days
UA 5191 and UA 3910 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.