UA 5437 then CZ 428 at O'Hare
Duluth → Chicago → Shanghai
Timetable, Chicago time
20:13UA 5437 from Duluth at the gate
00:30CZ 428 to Shanghai leaves the gate
4 h 17 apart on the timetable, overnight
The last days
UA 5437 and CZ 428 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.