UA 3908 then KJ 2913 at O'Hare
Columbus (Ohio) → Chicago → Seoul
Timetable, Chicago time
09:34UA 3908 from Columbus (Ohio) at the gate
15:40KJ 2913 to Seoul leaves the gate
6 h 06 apart on the timetable
The last days
UA 3908 and KJ 2913 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.