F9 1403 then UA 6094 at Houston
Atlanta → Houston → Denver
Timetable, Houston time
07:23F9 1403 from Atlanta at the gate
14:11UA 6094 to Denver leaves the gate
6 h 48 apart on the timetable
The last days
F9 1403 and UA 6094 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.