WN 591 then WN 257 at Denver
Baltimore → Denver → Nashville
Timetable, Denver time
10:15WN 591 from Baltimore at the gate
10:55WN 257 to Nashville leaves the gate
40 min apart on the timetable
The last days
WN 591 and WN 257 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.