DL 1630 then DL 4683 at Detroit
Rochester → Detroit → Grand Rapids
Timetable, Detroit time
07:24DL 1630 from Rochester at the gate
16:15DL 4683 to Grand Rapids leaves the gate
8 h 51 apart on the timetable
The last days
DL 1630 and DL 4683 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.