Time Difference: Chicago vs Sydney
Chicago
11:17:54 PM CDT
Saturday, June 27, 2026
15h
15h
Sydney
2:17:54 PM AEST
Sunday, June 28, 2026
Sydney is 15 hours ahead of Chicago.
Quick Reference
- Chicago
- CDT (GMT-5)
CST starts on Nov 1, 2026
- Sydney
- AEST (GMT+10)
AEDT starts on Oct 3, 2026
Frequently Asked Questions
- What is the time difference between Chicago and Sydney?
- Sydney is 15 hours ahead of Chicago.
- When is the best time to call from Chicago to Sydney?
- The best time to call is during overlapping business hours (9 AM – 5 PM) in both cities. Use the interactive converter on this page to visually compare hours side by side.
- Does the time difference change with daylight saving time?
- The time difference may change when either city enters or exits daylight saving time. Chicago uses CDT and Sydney uses AEST.