WN 3776 then WN 8839 at Denver
San Francisco → Denver → Kansas City
Timetable, Denver time
15:15WN 3776 from San Francisco at the gate
20:28WN 8839 to Kansas City leaves the gate
5 h 13 apart on the timetable
The last days
WN 3776 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.