Seoul to Hawaii (Honolulu) time
Hawaii (Honolulu) is 19 hours behind Seoul on UTC-10, and the nonstop flight takes about 8 hours 30 minutes.
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Seoul to Hawaii: the 19-hour gap explained
Seoul runs on UTC+9 and Honolulu on UTC-10, so the offset is a huge -19 hours, meaning Seoul is 19 hours ahead of Hawaii. When it is 12:00 noon in Seoul, it is 5:00 PM the previous day in Hawaii. If that is hard to picture, think of it as add 5 hours and subtract a day (12 + 5 = 17:00, yesterday). To reverse it, add 19 hours to any Hawaii time, or subtract 5 hours and add a day, to get Seoul time. Hawaii is one of the few US states that does not observe daylight saving, so this 19-hour gap holds all year. It effectively flips day and night, like being on the far side of the planet.
When people look this up
Hawaii is a top honeymoon and long-vacation spot, so travelers check the gap to work out arrival after the 8.5-hour nonstop flight. Here is the fun part: leave Incheon at 9:00 PM, fly 8.5 hours to reach 5:30 AM the next day in Korea time, then subtract 19 hours to land at 10:30 AM the same calendar day in Hawaii. In effect you arrive on the morning of the day you left, seeming to gain time and stretch the day. Because of the 19-hour gap, people constantly search 'what time is it in Korea right now' to time calls with family or the office. It also helps to convert a Waikiki sunset or a Pearl Harbor tour time into Korean hours when sharing updates live.
Reference points and a caveat
Hawaii Standard Time (HST, UTC-10) is even 2-3 hours behind the US West Coast (LA), making it one of the last places in America to start its day. The biggest trap is the date: you gain a day going there but lose a day coming back, so an evening departure from Hawaii feels like arriving in Korea two evenings later. Since 19 hours is 5 short of a full 24, it is easier to flip it: Korea is 5 hours behind Hawaii and one day ahead. Even though both are US territory, Guam (+1h) sits in the opposite direction, so never confuse the two. Note that because Hawaii skips DST, its gap with the US mainland shifts between summer and winter.
Frequently asked questions
If it is 12:00 noon in Seoul, what time is it in Hawaii?
It is 5:00 PM the previous day in Hawaii. Seoul (UTC+9) is 19 hours ahead of Honolulu (UTC-10).
How long is the flight from Incheon to Hawaii?
About 8 hours 30 minutes nonstop. A 9:00 PM departure lands around 10:30 AM the same calendar day, local Hawaii time.
Does Hawaii use daylight saving time?
No. Hawaii does not observe DST, so the gap with Seoul stays fixed at -19 hours all year.