UA 4683 then CA 3104 at O'Hare
Philadelphia → Chicago → Shanghai
Timetable, Chicago time
07:59UA 4683 from Philadelphia at the gate
11:40CA 3104 to Shanghai leaves the gate
3 h 41 apart on the timetable
The last days
UA 4683 and CA 3104 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.