St. Louis to Sydney Time Difference
Sydney is 15 hours ahead of St. Louis. When it is noon in St. Louis, it is 03:00 in Sydney.
Chicago (UTC-5) → Sydney (UTC+10)
🕐 Interactive Time Explorer
When it's 07:00 in St. Louis, it's 22:00 in Sydney
Drag the slider to see corresponding times in both cities
🤝 Best Meeting Times
St. Louis & Sydney◐ Extended Hours (5 hours)
✈️ Travel Information
Distance
14,586 km
Est. Flight Time
~18.2h
Time Difference
+15h
Work Hours Overlap
0h
None
🔴 Office Closed
No overlap available
No overlap
⏰ Quick Conversion
06:00
St. Louis
21:00
Sydney
09:00
St. Louis
00:00
Sydney (+1)
12:00
St. Louis
03:00
Sydney (+1)
15:00
St. Louis
06:00
Sydney (+1)
18:00
St. Louis
09:00
Sydney (+1)
21:00
St. Louis
12:00
Sydney (+1)
00:00
St. Louis
15:00
Sydney
03:00
St. Louis
18:00
Sydney
Frequently Asked Questions
How many hours is St. Louis behind Sydney?
Sydney is 15 hours ahead of St. Louis. When it is 12:00 noon in St. Louis, it is 03:00 in Sydney. St. Louis operates on America/Chicago (UTC-5), while Sydney uses Australia/Sydney (UTC+10).
What is the best time to call Sydney from St. Louis?
Standard business hours (9 AM–5 PM) do not overlap between St. Louis and Sydney due to the 15 hours difference. Consider early morning or late evening calls, or use async communication.
Does the St. Louis to Sydney time difference change throughout the year?
The time difference can shift by up to one hour when either city observes Daylight Saving Time (DST). DST transition dates differ between countries — typically March/April in the Northern Hemisphere and October in the Southern Hemisphere. Always verify the live difference above when scheduling important meetings near DST changeover dates.
Flying between St. Louis and Sydney
The distance between St. Louis and Sydney is approximately 14,586 km. A direct flight typically takes around 18.2 hours. Your arrival clock will show local Sydney time — use our Flight Time Calculator to predict exact arrival times.