WN 280 then WN 235 at Denver
Boston → Denver → Dallas
Timetable, Denver time
12:45WN 280 from Boston at the gate
17:35WN 235 to Dallas leaves the gate
4 h 50 apart on the timetable
The last days
WN 280 and WN 235 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.