Best Meeting Time: Chicago to Sydney
🕐 Live Timezone Overlap: Chicago & Sydney
Chicago and Sydney sit 15 hours apart, with Sydney ahead. That gap is large enough to eliminate any overlap between standard 9am to 6pm working hours in either city. Every meeting between the two requires at least one side to step outside normal hours. Chicago teams finish their day long before Sydney opens, so scheduling demands deliberate compromise rather than a convenient middle ground.
Time Difference: Chicago and Sydney
Sydney is currently 15 hours ahead of Chicago. The live offsets are Chicago UTC-5 and Sydney UTC+10. Chicago observes daylight saving and Sydney also observes daylight saving, so the offset shifts twice a year if both sides aren't already aligned.
Chicago currently runs at UTC-5, having shifted from its standard UTC-6 under US DST. Sydney is currently at UTC+10 (AEST), its standard offset, meaning Australian DST is not active right now. Both cities observe DST, but on opposite hemispheres: US DST and Australian DST run on different changeover weekends. This means the gap between Chicago and Sydney fluctuates across the year, moving between 15 and 17 hours depending on which DST periods overlap or diverge.
Best Times to Meet
With zero hours of working-hour overlap, there is no in-hours window to schedule against. One side must concede. The least disruptive option is typically a Chicago end-of-day call at 6pm to 7pm Central, which lands at 9am to 10am the following morning in Sydney. Sydney participants get a clean start; Chicago participants go slightly over. Avoid Monday mornings in Sydney and Friday evenings in Chicago, where engagement drops at either end of the week.
Working Hours Overlap Explained
Chicago operates on America/Chicago (currently UTC-5). Sydney operates on Australia/Sydney (currently UTC+10). The table below maps a standard 9:00 AM–6:00 PM day in Chicago to Sydney's local time.
| Chicago time | Sydney time | Status |
|---|---|---|
| 9:00 AM | 12:00 AM | Sydney outside hours |
| 10:00 AM | 1:00 AM | Sydney outside hours |
| 11:00 AM | 2:00 AM | Sydney outside hours |
| 12:00 PM | 3:00 AM | Sydney outside hours |
| 1:00 PM | 4:00 AM | Sydney outside hours |
| 2:00 PM | 5:00 AM | Sydney outside hours |
| 3:00 PM | 6:00 AM | Sydney outside hours |
| 4:00 PM | 7:00 AM | Sydney outside hours |
| 5:00 PM | 8:00 AM | Sydney just starting |
| 6:00 PM | 9:00 AM | Sydney in business hours |
Tips for Scheduling Across Chicago and Sydney
- Chicago at 6pm Central equals 9am next-day Sydney: use this as your default meeting anchor.
- Australian DST starts in October and ends in April, shifting the Chicago-Sydney gap by an hour each changeover.
- Sydney offices are lightly staffed from Christmas Day through Australia Day on 26 January: avoid scheduling during this period.
- Chicago trading desks at CME and CBOE open at 7am Central, so early Chicago mornings are not freely available for calls.
- US Thanksgiving falls on the fourth Thursday in November: book Sydney-side meetings that week well in advance to confirm attendance.
Public Holidays and Working Weeks
Both cities follow a standard Monday to Friday working week. Key holidays to watch: Chicago observes Independence Day on 4 July, Thanksgiving on the fourth Thursday in November, and Christmas Day on 25 December. Sydney observes Australia Day on 26 January, ANZAC Day on 25 April, and Christmas Day on 25 December. Sydney offices also run on skeleton staff from Christmas through to 26 January. Always check both calendars before locking in calls.