VA 8311 then WN 139 at San Francisco
Boston → San Francisco → San Diego
Timetable, San Francisco time
10:59VA 8311 from Boston at the gate
15:30WN 139 to San Diego leaves the gate
4 h 31 apart on the timetable
The last days
VA 8311 and WN 139 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.