Seoul to Chicago
-14hSeoul
KSTSOURCEChicago
CDTGreen rows indicate typical business hours (9 AM - 5 PM)
KST and CDT on the World Map
The map below highlights the KST (Korea Standard Time) and CDT (Central Standard Time) timezone regions across the globe.
KST – Korea Standard Time
UTC+09:00Korea Standard Time (KST) is the time zone for South Korea, 9 hours ahead of UTC.
- •South Korea does not observe daylight saving time.
- •Seoul is home to Samsung, LG, and Hyundai headquarters.
- •KST is the same offset as JST (UTC+09:00).
CST – Central Standard Time
UTC-06:00Central Standard Time (CST) is the time zone for the central United States, Canada, and Mexico, 6 hours behind UTC.
- •CST covers 20 US states fully or partially.
- •Chicago and Houston are the two largest cities in the Central Time Zone.
- •Mexico City, one of the world's most populous cities, operates on CST.
- •CST is 1 hour behind EST and 2 hours ahead of PST.
About Seoul
WikipediaSeoul operates on Korea Standard Time (KST), UTC+9, same as Japan. As a global tech and entertainment hub, Seoul coordinates with East Asian markets.
Seoul has the fastest average internet speed in the world.
About Chicago
WikipediaChicago operates on Central Time (CST/CDT), 1 hour behind New York. Home to CME and CBOE, Chicago is a global center for derivatives trading.
The Chicago Board of Trade is the world's oldest futures and options exchange.
Time Conversion Guide: Seoul to Chicago
Seoul runs on Korean Standard Time (KST) at UTC+09:00. Chicago runs on Central Daylight Time (CDT) at UTC-05:00, also currently on daylight saving time. That puts Seoul 14 hours behind Chicago — a difference of -14h at the current offsets.
In practice, when it is 9:00 AM in Seoul it is 7:00 PM in Chicago on the previous day. Midnight in Seoul is 10:00 AM in Chicago.Chicago observes daylight saving time while Seoul does not, so the gap narrows or widens by an hour part of the year.
Seoul to Chicago time conversion table
| Seoul (KST) | Chicago (CDT) | Day |
|---|---|---|
| 12:00 AM | 10:00 AM | previous day |
| 6:00 AM | 4:00 PM | previous day |
| 7:00 AM | 5:00 PM | previous day |
| 8:00 AM | 6:00 PM | previous day |
| 9:00 AM | 7:00 PM | previous day |
| 12:00 PM | 10:00 PM | previous day |
| 3:00 PM | 1:00 AM | same day |
| 5:00 PM | 3:00 AM | same day |
| 6:00 PM | 4:00 AM | same day |
| 9:00 PM | 7:00 AM | same day |
Why people convert Seoul to Chicago time
- Scheduling a call from Seoul to Chicago: a 10:00 AM start in Seoul lands at 8:00 PM in Chicago the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -14h gap: Seoul and Chicago have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in Chicago is 7:00 PM in Seoul.
- Coordinating a Seoul-based team with Chicago contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM KST" is unambiguous; "3 PM" across a -14h gap is not.
- With a -14h gap there is no shared 9-to-5 window, so alternate the early start: one week Seoul takes the early slot, the next week Chicago does.
- Chicago: Clocks fall back on Sun, Nov 1, 2026. Any meeting series spanning that date will shift by an hour in local time.
About KST (Korea Standard Time)
Korea Standard Time (KST) is the time zone used in South Korea. It shares the same UTC offset as Japan Standard Time but is a distinct time zone. South Korea does not observe daylight saving time. Seoul, the capital, is a major global tech and business hub.
About CST (Central Standard Time)
Central Standard Time (CST) covers the central region of North America. It is the second most populous time zone in the US, including major cities like Chicago, Houston, and Dallas. CST is also used in Mexico City and much of Central America including Guatemala, Honduras, El Salvador, and Costa Rica. During summer, most of the US and Canada switch to Central Daylight Time (CDT, UTC-05:00), while Mexico and Central American countries generally remain on CST.
Best time to call between Seoul and Chicago
With a -14h offset there is no overlap inside a normal 9 AM – 5 PM day. Chicago opens at 9:00 AM CDT, which is 7:00 PM in Seoul, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Seoul and Chicago have no shared working hours because of the -14h gap. Teams need to alternate early starts or rely on asynchronous handovers.
Seoul is 14 hours behind Chicago (KST UTC+09:00 → CDT UTC-05:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Seoul
Does not observe DST
Chicago
☀ Currently in DST
Standard: UTC-06:00 · DST: UTC-05:00
Clocks fall back on Sun, Nov 1, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between Seoul and Chicago?
Seoul (KST, UTC+09:00) is 14 hours behind Chicago (CDT, UTC-05:00). The gap is currently -14h.
How do I convert Seoul time to Chicago time?
Add -14h to Seoul local time. For example, 9:00 AM in Seoul is 7:00 PM in Chicago (previous day).
What time is it in Chicago right now?
Chicago uses CDT at UTC-05:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -14h offset from Seoul.
What is the best time to call Chicago from Seoul?
There is no shared working-hours window because of the -14h gap. The closest option is 1:00 PM in Seoul, which is 11:00 PM in Chicago.
Which is behind, Seoul or Chicago?
Seoul is 14 hours behind Chicago. When it is 12:00 PM in Seoul it is 10:00 PM in Chicago.
Do Seoul and Chicago use different time zones?
Seoul (South Korea) uses KST at UTC+09:00, while Chicago (USA) uses CDT at UTC-05:00. The IANA identifiers are Asia/Seoul and America/Chicago.
Does daylight saving time affect the Seoul–Chicago difference?
Yes at the moment: Chicago is on daylight saving time and Seoul is not, so the -14h gap shifts by an hour when exactly one of them changes clocks.
Which other cities share Seoul's time zone?
KST also covers Seoul, Busan, Incheon, Daegu, Daejeon, Pyongyang.
Which countries use KST, Seoul's zone?
KST is used in South Korea, North Korea.
Is there a day difference between Seoul and Chicago?
Sometimes. The -14h gap is large enough that 8:00 PM or later in Seoul already falls on the in Chicago.
What is the time difference between Seoul and Chicago?
Chicago is -14h from Seoul.
What timezone is Seoul in?
Seoul operates on Korea Standard Time (KST), UTC+9, same as Japan. As a global tech and entertainment hub, Seoul coordinates with East Asian markets.
What timezone is Chicago in?
Chicago operates on Central Time (CST/CDT), 1 hour behind New York. Home to CME and CBOE, Chicago is a global center for derivatives trading.
What are the business hours in Seoul?
Standard business hours in Seoul are 9:00 AM - 6:00 PM KST.
What are the business hours in Chicago?
Standard business hours in Chicago are 8:00 AM - 5:00 PM CST.
What is the best time to schedule a call between Seoul and Chicago?
The best overlap for a call is when both cities are in business hours. Seoul works 9:00 AM - 6:00 PM KST and Chicago works 8:00 AM - 5:00 PM CST (-14h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Seoul and Chicago?
Seoul uses KRW (₩) while Chicago uses USD ($). Check current exchange rates when planning travel or business between these cities.
How do Seoul and Chicago compare in size?
Seoul has a population of approximately 9.7 million (metro: 25.5 million), while Chicago has approximately 2.7 million (metro: 9.5 million).
What are the major landmarks in Seoul and Chicago?
Seoul is known for Gyeongbokgung Palace, N Seoul Tower, Bukchon Hanok Village. Chicago is famous for Willis Tower, Millennium Park, Cloud Gate (The Bean).
Do Seoul and Chicago have stock exchanges?
Yes. Seoul has the KRX (Korea Exchange) and Chicago has the CME (Chicago Mercantile Exchange), CBOE. The -14h time difference affects trading hour overlaps between these exchanges.
Which countries use KST (Korea Standard Time)?
KST is used in South Korea, North Korea.
Does KST observe daylight saving time?
No, KST does not observe daylight saving time and remains at UTC+09:00 year-round.
What are some interesting facts about KST?
South Korea does not observe daylight saving time. Seoul is home to Samsung, LG, and Hyundai headquarters.
Which cities are in the CST timezone?
Major cities in the CST timezone include Chicago, Houston, Dallas, San Antonio, Mexico City, Austin, Winnipeg, Memphis.
What is the UTC offset for CST?
Central Standard Time (CST) is at UTC-06:00. During daylight saving time, it shifts to CDT.
What should I know about the CST timezone?
CST covers 20 US states fully or partially. Chicago and Houston are the two largest cities in the Central Time Zone.
When is it midnight in Seoul, what time is it in Chicago?
When it is 12:00 AM (midnight) in Seoul (KST), it is -14h later in Chicago (CST).
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