WN 855 then UA 605 at Denver
Dallas → Denver → Nashville
Timetable, Denver time
07:10WN 855 from Dallas at the gate
07:54UA 605 to Nashville leaves the gate
44 min apart on the timetable
The last days
WN 855 and UA 605 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.