DL 1931 then DL 843 at Phoenix
Seattle → Phoenix → San Diego
Timetable, Phoenix time
15:47DL 1931 from Seattle at the gate
16:35DL 843 to San Diego leaves the gate
48 min apart on the timetable
The last days
DL 1931 and DL 843 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.