Observatory log
Seoul and Chicago, compared
- 01Difference now
Chicago is 14 hours behind Seoul.
Seoul: KST (UTC+9) · Chicago: CDT (UTC−5)
Next changeFrom 1 November 2026: Chicago is 15 hours behind Seoul.
- 02Through 2026–2027
- 1 January 2026 – 8 March 2026−15 h
- 8 March 2026 – 1 November 2026−14 h
- 1 November 2026 – 14 March 2027−15 h
- 14 March 2027 – 7 November 2027−14 h
- 7 November 2027 – 31 December 2027−15 h
Difference of Chicago from Seoul. It changes on the days either place changes its clocks (dates local to that place).
- 03Shared working hours
Their working days never overlap.
Counted as 09:00–17:00 local time on each place’s own working days, for the next seven days.
- 04Best time to meet
09:00–12:00 in Seoul = 19:00–22:00 in Chicago
No shared office hours: this is early or late for one side (Tue–Fri).
Also possible: Tue–Fri: 06:00–07:00 in Seoul = 16:00–17:00 in Chicago (yesterday) · 1 h.
- 05Weekend
Seoul: Saturday and Sunday
Chicago: Saturday and Sunday
24 hours
A day in Seoul, in Chicago
| Seoul | Chicago | Working hours, evening, night or weekend in each place |
|---|---|---|
| 00:00 | 10:00Yesterday | |
| 01:00 | 11:00Yesterday | |
| 02:00 | 12:00Yesterday | |
| 03:00 | 13:00Yesterday | |
| 04:00 | 14:00Yesterday | |
| 05:00 | 15:00Yesterday | |
| 06:00 | 16:00Yesterday | |
| 07:00 | 17:00Yesterday | |
| 08:00 | 18:00Yesterday | |
| 09:00 | 19:00Yesterday | |
| 10:00 | 20:00Yesterday | |
| 11:00 | 21:00Yesterday | |
| 12:00 | 22:00Yesterday | |
| 13:00 | 23:00Yesterday | |
| 14:00 | 00:00 | |
| 15:00 | 01:00 | |
| 16:00 | 02:00 | |
| 17:00 | 03:00 | |
| 18:00 | 04:00 | |
| 19:00 | 05:00 | |
| 20:00 | 06:00 | |
| 21:00 | 07:00 | |
| 22:00 | 08:00 | |
| 23:00 | 09:00 |
Working hoursEarly or eveningNightWeekend
Plan a meeting: Seoul and Chicago
More time differences with Seoul
More time differences with Chicago
Questions
Asked about Seoul and Chicago
What is the time difference between Seoul and Chicago?
Chicago is 14 hours behind Seoul. This holds until 1 November 2026; then Chicago is 15 hours behind Seoul.
What is the best time for a call between Seoul and Chicago?
No shared office hours. The least awkward windows, early or late for one side: Tue–Fri: 09:00–12:00 in Seoul = 19:00–22:00 in Chicago (yesterday) · 3 h; Tue–Fri: 06:00–07:00 in Seoul = 16:00–17:00 in Chicago (yesterday) · 1 h.
When does the time difference between Seoul and Chicago change?
In the next 12 months it changes on: 1 November 2026 (−15 h); 14 March 2027 (−14 h).