WN 752 then WN 1773 at Denver
Cleveland → Denver → San Francisco
Timetable, Denver time
15:15WN 752 from Cleveland at the gate
18:25WN 1773 to San Francisco leaves the gate
3 h 10 apart on the timetable
The last days
WN 752 and WN 1773 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.