DL 1317 then DL 2525 at Salt Lake City
Denver → Salt Lake City → Phoenix Sky Harbor
Timetable, Salt Lake City time
12:21DL 1317 from Denver at the gate
15:35DL 2525 to Phoenix Sky Harbor leaves the gate
3 h 14 apart on the timetable
The last days
DL 1317 and DL 2525 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.