F9 1748 then WN 1778 at Denver
Phoenix Sky Harbor → Denver → San Diego
Timetable, Denver time
11:59F9 1748 from Phoenix Sky Harbor at the gate
12:20WN 1778 to San Diego leaves the gate
21 min apart on the timetable
The last days
F9 1748 and WN 1778 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.