Sydney to St. Louis Time Difference
St. Louis is 15 hours behind Sydney. When it is noon in Sydney, it is 21:00 in St. Louis.
Sydney (UTC+10) → Chicago (UTC-5)
🕐 Interactive Time Explorer
When it's 06:00 in Sydney, it's 15:00 in St. Louis
Drag the slider to see corresponding times in both cities
🤝 Best Meeting Times
Sydney & St. Louis◐ 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
Sydney
15:00
St. Louis (-1)
09:00
Sydney
18:00
St. Louis (-1)
12:00
Sydney
21:00
St. Louis (-1)
15:00
Sydney
00:00
St. Louis
18:00
Sydney
03:00
St. Louis
21:00
Sydney
06:00
St. Louis
00:00
Sydney
09:00
St. Louis (-1)
03:00
Sydney
12:00
St. Louis (-1)
Frequently Asked Questions
How many hours is Sydney ahead of St. Louis?
St. Louis is 15 hours behind Sydney. When it is 12:00 noon in Sydney, it is 21:00 in St. Louis. Sydney operates on Australia/Sydney (UTC+10), while St. Louis uses America/Chicago (UTC-5).
What is the best time to call St. Louis from Sydney?
Standard business hours (9 AM–5 PM) do not overlap between Sydney and St. Louis due to the 15 hours difference. Consider early morning or late evening calls, or use async communication.
Does the Sydney to St. Louis 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 Sydney and St. Louis
The distance between Sydney and St. Louis is approximately 14,586 km. A direct flight typically takes around 18.2 hours. Your arrival clock will show local St. Louis time — use our Flight Time Calculator to predict exact arrival times.