UA 1074 then UA 436 at San Francisco
Boston → San Francisco → Ontario
Timetable, San Francisco time
13:34UA 1074 from Boston at the gatealso VA 8313, NZ 9021
16:35UA 436 to Ontario leaves the gate
3 h 01 apart on the timetable
The last days
UA 1074 and UA 436 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.