UA 654 then F9 2995 at Houston
Los Angeles → Houston → Denver
Timetable, Houston time
11:08UA 654 from Los Angeles at the gate
21:43F9 2995 to Denver leaves the gate
10 h 35 apart on the timetable
The last days
UA 654 and F9 2995 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.