How long is the flight to Seoul South Korea?
The below times are for non stop flight segments to Incheon International Airport (ICN). From Honolulu International Airport (HNL), the flight time is roughly 10 hours and 5 minutes. From Detroit Metropolitan Wayne County Airport (DTW), the flight time is roughly 13 hours and 13 minutes. From San Francisco International Airport (SFO), the flight time is roughly 11 hours and 18 minutes.
Please keep in mind that the above are time in the air; most travel sites will quote a ramp to ramp time which is about a 1/2 hour greater than the air time.