WN 839 then WN 8839 at Denver
Buffalo → Denver → Kansas City
Timetable, Denver time
18:20WN 839 from Buffalo at the gate
20:28WN 8839 to Kansas City leaves the gate
2 h 08 apart on the timetable
The last days
WN 839 and WN 8839 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.