The best time to call Chicago from Seoul is 9 AM–11 AM your time (Seoul). Chicago, USA is 10 hours ahead of Seoul, South Korea. There is no standard business hours overlap, so one party will need to adjust their schedule.
Call between 9 AM–11 AM Seoul time.
Seoul and Chicago have no overlapping standard business hours. One party will need to adjust.
The best time to call Chicago from Seoul is 9 AM–11 AM Seoul time. There is no standard business hours overlap between these cities.
Chicago is 10 hours ahead of Seoul.
Avoid calling before 9 PM your time (they haven't started their day). Consider email or async communication for non-urgent matters.
No, Seoul and Chicago do not have overlapping standard business hours (9 AM – 5 PM). You will need to schedule calls outside normal hours for one party.
No business hours overlap. You'll need to call outside standard hours — 9 AM–11 AM your time is the least disruptive window.
Both in business hours Both awake One outside comfort zone Sleeping hours
No standard business hours overlap (9 AM – 5 PM) between Seoul and Chicago.
One party will need to adjust their schedule for calls.
| Seoul (GMT+9) | Chicago (CDT) | Status |
|---|---|---|
| 7 AM | 5 PM | 🟡 They're awake |
| 8 AM | 6 PM | 🟡 They're awake |
| 9 AM | 7 PM | 🟡 They're awake |
| 10 AM | 8 PM | 🟡 They're awake |
| 11 AM | 9 PM | 🟡 They're awake |
| 12 PM | 10 PM | 🔴 They're sleeping |
| 1 PM | 11 PM | 🔴 They're sleeping |
| 2 PM | 12 AM | 🔴 They're sleeping |
| 3 PM | 1 AM | 🔴 They're sleeping |
| 4 PM | 2 AM | 🔴 They're sleeping |
| 5 PM | 3 AM | 🔴 They're sleeping |
| 6 PM | 4 AM | 🔴 They're sleeping |
| 7 PM | 5 AM | 🔴 They're sleeping |
| 8 PM | 6 AM | 🔴 They're sleeping |
| 9 PM | 7 AM | 🟡 They're awake |