DL 8939 then OZ 6303 at San Francisco
Phoenix → San Francisco → Chicago O'Hare
Timetable, San Francisco time
14:57DL 8939 from Phoenix at the gate
17:10OZ 6303 to Chicago O'Hare leaves the gate
2 h 13 apart on the timetable
The last days
DL 8939 and OZ 6303 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.