WN 855 then DL 2177 at Denver
Dallas → Denver → Detroit
Timetable, Denver time
07:10WN 855 from Dallas at the gate
16:09DL 2177 to Detroit leaves the gate
8 h 59 apart on the timetable
The last days
WN 855 and DL 2177 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.