WN 2275 then WN 1997 at San Francisco
Dallas → San Francisco → Las Vegas
Timetable, San Francisco time
09:40WN 2275 from Dallas at the gate
13:30WN 1997 to Las Vegas leaves the gate
3 h 50 apart on the timetable
The last days
WN 2275 and WN 1997 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.