CX 7955 then UA 3752 at San Francisco
Seattle → San Francisco → Denver
Timetable, San Francisco time
21:47CX 7955 from Seattle at the gate
04:28UA 3752 to Denver leaves the gate
6 h 41 apart on the timetable, overnight
The last days
CX 7955 and UA 3752 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.