K4 550 then JL 6717 at Narita
Chicago → Tokyo → Seoul
Timetable, Tokyo time
11:59K4 550 from Chicago at the gate
12:10JL 6717 to Seoul leaves the gate
11 min apart on the timetable
The last days
K4 550 and JL 6717 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.