UA 3820 then Y4 2004 at San Francisco
Everett → San Francisco → Ontario
Timetable, San Francisco time
15:11UA 3820 from Everett at the gate
18:04Y4 2004 to Ontario leaves the gate
2 h 53 apart on the timetable
The last days
UA 3820 and Y4 2004 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.