WN 855 then WN 1801 at Denver
Dallas → Denver → Atlanta
Timetable, Denver time
07:10WN 855 from Dallas at the gate
13:50WN 1801 to Atlanta leaves the gate
6 h 40 apart on the timetable
The last days
WN 855 and WN 1801 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.