WN 855 then WN 657 at Denver
Dallas → Denver → Detroit
Timetable, Denver time
07:10WN 855 from Dallas at the gate
17:25WN 657 to Detroit leaves the gate
10 h 15 apart on the timetable
The last days
WN 855 and WN 657 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.