F9 1572 then DL 1451 at Phoenix
San Diego → Phoenix → Salt Lake City
Timetable, Phoenix time
13:41F9 1572 from San Diego at the gate
20:11DL 1451 to Salt Lake City leaves the gate
6 h 30 apart on the timetable
The last days
F9 1572 and DL 1451 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.