WN 3370 then WN 1652 at San Francisco
Dallas → San Francisco → Denver
Timetable, San Francisco time
09:30WN 3370 from Dallas at the gate
13:45WN 1652 to Denver leaves the gate
4 h 15 apart on the timetable
The last days
WN 3370 and WN 1652 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.