UA 2264 then WN 657 at Denver
Washington → Denver → Detroit
Timetable, Denver time
08:19UA 2264 from Washington at the gate
17:25WN 657 to Detroit leaves the gate
9 h 06 apart on the timetable
The last days
UA 2264 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.