WN 2019 then WN 8505 at Phoenix
Tucson → Phoenix → Denver
Timetable, Phoenix time
06:55WN 2019 from Tucson at the gate
07:45WN 8505 to Denver leaves the gate
50 min apart on the timetable
The last days
WN 2019 and WN 8505 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.