Seoul to Chicago time
Convert Seoul (UTC+9) to Chicago (US Central, CST/CDT) for any date — the tool auto-applies daylight saving, so you get the exact 14-hour summer or 15-hour winter gap every time.
Enter a valid date and time.
🔒 Conversion runs only in your browser — it works offline and nothing is uploaded.
Why the gap flips between 14 and 15 hours
Seoul sits at UTC+9 all year and never observes daylight saving time, while Chicago switches to daylight time (CDT, UTC-5) from the second Sunday in March to the first Sunday in November. So the entire change comes from Chicago's side. During the US summer, Seoul is 14 hours ahead; once Chicago falls back to standard time (CST, UTC-6) in winter, Seoul is 15 hours ahead. Double-check any time that lands in the mid-March or early-November switch week, when the gap shifts by an hour.
A Seoul morning is the 'day before' in Chicago
Because Seoul runs 14 to 15 hours ahead, the calendar day usually flips. In summer, 9:00 AM in Seoul is 7:00 PM the previous day in Chicago; in winter it's 6:00 PM the previous day. Going the other way, 9:00 AM in Chicago (the start of the local workday) is 11:00 PM the same evening in Seoul in summer, and midnight (12:00 AM the next day) in winter. To match Chicago office hours, expect to book late-night or early-morning slots in Seoul.
Calls, meetings, flights, and live sports
Use it to ring family or students in Chicago, schedule a call with the CME or a Midwest client, or check the local arrival time of an O'Hare (ORD) connection. To catch a Cubs, Bulls, or Bears broadcast, or the US market open (8:30 AM Central), drop the date into the converter above. It reads whether that date falls inside Chicago's daylight-saving window and applies the right 14- or 15-hour offset, so you never have to count the hours yourself.
Frequently asked questions
What is the time difference between Seoul and Chicago?
Seoul is ahead of Chicago — by 14 hours during US daylight saving time (roughly mid-March to early November) and by 15 hours during the winter standard-time months. The one-hour swing happens because Seoul stays fixed at UTC+9 while only Chicago moves between CST (UTC-6) and CDT (UTC-5).
If it's 9:00 AM in Seoul, what time is it in Chicago?
In summer (daylight time) it's 7:00 PM the previous day in Chicago; in winter (standard time) it's 6:00 PM the previous day. Seoul is so far ahead that its morning falls on the evening of the day before in Chicago.
Does the tool handle daylight saving for me?
Yes. It checks whether your chosen date falls inside Chicago's daylight-saving window and applies either the 14- or 15-hour difference automatically. Seoul has no DST, so there's nothing to adjust on that side — just pick the exact date around the March and November switchovers. (Note: southern-hemisphere cities run DST in the opposite season, which flips the direction, but Chicago is in the northern hemisphere, so that doesn't apply here.)