Best time to call Sydney from Chicago
There is no 9-to-5 overlap between these cities. Best compromise: 4 PM–10 PM in Chicago (7 AM–1 PM the next day in Sydney), both sides are at least awake (7 AM–10 PM). Sydney is 15 hours ahead of Chicago. (as of July 2026, recalculated live in your browser.)
Live from your device clock via the IANA time-zone database built into your browser.
Hour-by-hour overlap
Both 9 AM–5 PM Both awake (7 AM–10 PM) One side asleep
| Chicago | Sydney | Call quality |
|---|---|---|
| 12 AM | 3 PM | Too early / too late |
| 1 AM | 4 PM | Too early / too late |
| 2 AM | 5 PM | Too early / too late |
| 3 AM | 6 PM | Too early / too late |
| 4 AM | 7 PM | Too early / too late |
| 5 AM | 8 PM | Too early / too late |
| 6 AM | 9 PM | Too early / too late |
| 7 AM | 10 PM | Too early / too late |
| 8 AM | 11 PM | Too early / too late |
| 9 AM | 12 AM +1 day | Too early / too late |
| 10 AM | 1 AM +1 day | Too early / too late |
| 11 AM | 2 AM +1 day | Too early / too late |
| 12 PM | 3 AM +1 day | Too early / too late |
| 1 PM | 4 AM +1 day | Too early / too late |
| 2 PM | 5 AM +1 day | Too early / too late |
| 3 PM | 6 AM +1 day | Too early / too late |
| 4 PM | 7 AM +1 day | One side off-hours |
| 5 PM | 8 AM +1 day | One side off-hours |
| 6 PM | 9 AM +1 day | One side off-hours |
| 7 PM | 10 AM +1 day | One side off-hours |
| 8 PM | 11 AM +1 day | One side off-hours |
| 9 PM | 12 PM +1 day | One side off-hours |
| 10 PM | 1 PM +1 day | Too early / too late |
| 11 PM | 2 PM +1 day | Too early / too late |
Grid prerendered July 2026 and recomputed in your browser on load, so daylight-saving switches are always reflected. Both Chicago and Sydney observe daylight saving time, but they switch on different dates, the gap between them shifts for a few weeks each spring and autumn.
Frequently asked questions
How many hours ahead is Sydney of Chicago?
Sydney is 15 hours ahead of Chicago. (Checked July 2026; where daylight saving applies, the gap can shift by an hour part of the year, the page recalculates live.)
What time is 9 AM in Chicago in Sydney?
9 AM in Chicago is 12 AM the next day in Sydney.
Do Chicago and Sydney change clocks for daylight saving?
Both Chicago and Sydney observe daylight saving time, but they switch on different dates, the gap between them shifts for a few weeks each spring and autumn.
Which hours work for a call?
There is no 9-to-5 overlap between these cities. Best compromise: 4 PM–10 PM in Chicago (7 AM–1 PM the next day in Sydney), both sides are at least awake (7 AM–10 PM).