DL 4655 then DL 1826 at Detroit
Rochester → Detroit → Washington
Timetable, Detroit time
14:08DL 4655 from Rochester at the gate
14:55DL 1826 to Washington leaves the gate
47 min apart on the timetable
The last days
DL 4655 and DL 1826 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.