5X 610 then UA 5539 at O'Hare
Philadelphia → Chicago → Cleveland
Timetable, Chicago time
04:215X 610 from Philadelphia at the gate
10:50UA 5539 to Cleveland leaves the gate
6 h 29 apart on the timetable
The last days
5X 610 and UA 5539 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.