Houston to Sydney Time Difference
Sydney is 15 hours ahead of Houston. When it is noon in Houston, it is 03:00 in Sydney.
Chicago (UTC-5) → Sydney (UTC+10)
🕐 Interactive Time Explorer
When it's 13:00 in Houston, it's 04:00 in Sydney
Drag the slider to see corresponding times in both cities
🤝 Best Meeting Times
Houston & Sydney◐ Extended Hours (5 hours)
✈️ Travel Information
Distance
13,818 km
Est. Flight Time
~17.3h
Time Difference
+15h
Work Hours Overlap
0h
None
🔴 Office Closed
No overlap available
No overlap
⏰ Quick Conversion
06:00
Houston
21:00
Sydney
09:00
Houston
00:00
Sydney (+1)
12:00
Houston
03:00
Sydney (+1)
15:00
Houston
06:00
Sydney (+1)
18:00
Houston
09:00
Sydney (+1)
21:00
Houston
12:00
Sydney (+1)
00:00
Houston
15:00
Sydney
03:00
Houston
18:00
Sydney
Frequently Asked Questions
How many hours is Houston behind Sydney?
Sydney is 15 hours ahead of Houston. When it is 12:00 noon in Houston, it is 03:00 in Sydney. Houston operates on America/Chicago (UTC-5), while Sydney uses Australia/Sydney (UTC+10).
What is the best time to call Sydney from Houston?
Standard business hours (9 AM–5 PM) do not overlap between Houston and Sydney due to the 15 hours difference. Consider early morning or late evening calls, or use async communication.
Does the Houston 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 Houston and Sydney
The distance between Houston and Sydney is approximately 13,818 km. A direct flight typically takes around 17.3 hours. Your arrival clock will show local Sydney time — use our Flight Time Calculator to predict exact arrival times.