Chicago is 15 hours behind Australia. Midday in Chicago lines up with 03:00 in Australia.
Chicago runs on America/Chicago; Australia runs on Australia/Sydney. Together they are 15 hours apart.
Business hours comparison
There is no business hours overlap between Chicago and Australia during standard working hours (9:00–17:00). Meetings would require one party to work outside normal hours.
Best times to schedule a meeting
Chicago and Australia have no shared working window. These slots minimize out-of-hours disruption for both sides.
16:00 Chicago / 07:00 Sydney⚡ One side off-hours
⚠️ 2h before working hours in Sydney
18:00 Chicago / 09:00 Sydney⚡ One side off-hours
⚠️ 2h after working hours in Chicago
15:00 Chicago / 06:00 Sydney⚡ One side off-hours
⚠️ 3h before working hours in Sydney
Working hours defined as 09:00–17:00 local time for each location.
Upcoming public holidays
⚡ Watch out — upcoming holidays on both sides. Verify availability in advance.
Chicago6 holidays
Sep 7Labour DaySOON
Oct 12Columbus Day
Oct 12Indigenous Peoples' Day
Nov 11Veterans Day
Nov 26Thanksgiving Day
Australia6 holidays
Sep 28King's Birthday
Oct 5Labour Day
Oct 5King's Birthday
Nov 3Melbourne Cup
Dec 25Christmas Day
How to work with Chicago and Australia time zones
Teams in Chicago (USA) and Australia (Australia) deal with a 15-hour gap that pushes their working days apart. Real-time meetings always require someone to stretch outside the standard 9–5.
💡 How to schedule across these time zones
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A 16:00 meeting in Chicago means 07:00 in Australia (2h before working hours in Sydney).
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A 18:00 meeting in Chicago means 09:00 in Australia (2h after working hours in Chicago).
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A 15:00 meeting in Chicago means 06:00 in Australia (3h before working hours in Sydney).
Since there is no natural overlap, the options above represent the most balanced compromise, minimizing out-of-hours inconvenience for both sides.
Avoid scheduling mistakes — especially around daylight saving changes. Use the ClockinSync Chrome Extension to instantly verify and compare both time zones directly in your browser, without manual calculations.
Need a specific time? Use the slider or type directly into the input bar — it understands "3pm", "15:30", and location-specific formats like "9am Chicago".
