B6 811 then CZ 2508 at O'Hare
Boston → Chicago → Guangzhou
Timetable, Chicago time
19:17B6 811 from Boston at the gate
19:50CZ 2508 to Guangzhou leaves the gate
33 min apart on the timetable
The last days
B6 811 and CZ 2508 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.