Chicago to Seoul Time Difference
Seoul is 14 hours ahead of Chicago. When it's 07:55:58 AM in Chicago, it's 09:55:58 PM in Seoul.
How Many Hours Ahead Is Seoul From Chicago?
Seoul is 14 hours ahead of Chicago. So Chicago is 14 hours behind Seoul looking the other way — the same gap, described from the other end.
In practice that means a working day in Chicago starts when it is already 11:00 PM in Seoul. The gap is not fixed all year: it becomes 15 hours on Sunday, November 1, 2026, when Chicago changes its clocks.
Best Time to Call Chicago and Seoul
Standard 9-to-5 hours in Chicago and Seoul never overlap, so someone has to take the call outside their working day. The most workable window is 5:00 PM to 10:00 PM in Chicago, which is 7:00 AM to 12:00 PM in Seoul.
both at work Chicago only Seoul only neither — hours shown along the strip are Chicago local time.
Convert a Specific Time
Pick any date and time in Chicago to see the exact equivalent in Seoul.
Common Times Converted
Chicago time on the left, Seoul time on the right.
Chicago to Seoul: Full 24-Hour Conversion Table
Based on today, Sunday, October 11, 2026 in Chicago. Shaded rows are working hours; the darker shade marks the hours when both cities are at work.
| Chicago | Seoul | Working hours |
|---|---|---|
| 12:00 AM | 2:00 PM | Seoul only |
| 1:00 AM | 3:00 PM | Seoul only |
| 2:00 AM | 4:00 PM | Seoul only |
| 3:00 AM | 5:00 PM | — |
| 4:00 AM | 6:00 PM | — |
| 5:00 AM | 7:00 PM | — |
| 6:00 AM | 8:00 PM | — |
| 7:00 AM | 9:00 PM | — |
| 8:00 AM | 10:00 PM | — |
| 9:00 AM | 11:00 PM | Chicago only |
| 10:00 AM | 12:00 AM next day | Chicago only |
| 11:00 AM | 1:00 AM next day | Chicago only |
| 12:00 PM | 2:00 AM next day | Chicago only |
| 1:00 PM | 3:00 AM next day | Chicago only |
| 2:00 PM | 4:00 AM next day | Chicago only |
| 3:00 PM | 5:00 AM next day | Chicago only |
| 4:00 PM | 6:00 AM next day | Chicago only |
| 5:00 PM | 7:00 AM next day | — |
| 6:00 PM | 8:00 AM next day | — |
| 7:00 PM | 9:00 AM next day | Seoul only |
| 8:00 PM | 10:00 AM next day | Seoul only |
| 9:00 PM | 11:00 AM next day | Seoul only |
| 10:00 PM | 12:00 PM next day | Seoul only |
| 11:00 PM | 1:00 PM next day | Seoul only |
Understanding the Chicago – Seoul Time Difference
Chicago runs on America/Chicago, currently CDT (UTC-5:00). Seoul runs on Asia/Seoul, currently KST (UTC+9:00). The gap of 14 hours is simply the distance between those two offsets.
Chicago observes Daylight Saving Time and Seoul does not, so the gap between them shifts by an hour twice a year. The next shift is on Sunday, November 1, 2026, when Chicago adjusts its clocks and the difference becomes 15 hours. Anything scheduled across that date needs checking again.
Full clock-change dates: Daylight Saving Time in the United States.
Chicago today
Seoul today
Frequently Asked Questions
What is the time difference between Chicago and Seoul?
Seoul is currently 14 hours ahead of Chicago. That gap becomes 15 hours on Sunday, November 1, 2026, when Chicago changes its clocks.
How many hours ahead is Seoul from Chicago?
Seoul is 14 hours ahead of Chicago. Looking at it the other way, Chicago is 14 hours behind Seoul.
What time is it in Seoul when it is 9:00 AM in Chicago?
When it is 9:00 AM in Chicago, it is 11:00 PM in Seoul.
Is Seoul ahead of or behind Chicago?
Seoul is 14 hours ahead of Chicago. Seoul reaches each point in the day first, so its working day is already finishing while Chicago is still getting started.
What is the best time to call between Chicago and Seoul?
Standard business hours in Chicago and Seoul do not overlap at all, so one side has to step outside the 9-to-5. The most workable window is 5:00 PM to 10:00 PM in Chicago, which is 7:00 AM to 12:00 PM in Seoul.
Does the time difference between Chicago and Seoul change during the year?
Yes. Chicago observes Daylight Saving Time and Seoul does not, so the gap between them shifts during the year. It changes to 15 hours on Sunday, November 1, 2026.
What time zones are Chicago and Seoul in?
Chicago uses the America/Chicago time zone, currently CDT (UTC-5:00). Seoul uses Asia/Seoul, currently KST (UTC+9:00).