UA 337 then WN 1574 at Denver
Phoenix Sky Harbor → Denver → Nashville
Timetable, Denver time
08:10UA 337 from Phoenix Sky Harbor at the gate
17:25WN 1574 to Nashville leaves the gate
9 h 15 apart on the timetable
The last days
UA 337 and WN 1574 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.