Time difference
St. Louis to Sydney Time Difference
Sydney is 16 hours ahead of St. Louis — when it's 12:00 PM in St. Louis, it's 4:00 AM the next day in Sydney. (St. Louis (America/Chicago, CDT); Sydney (Australia/Sydney, AEDT).) Below: live local times, the best hours for a call, a full conversion table, and exact daylight-saving dates.
Sydney is 16 hours ahead of St. Louis. Standard 9 AM–5 PM business hours in St. Louis and Sydney do not overlap, so a live call needs one side outside normal hours. Clocks change on November 1, 2026, which briefly shifts the gap between St. Louis and Sydney — the converter on this page always reflects the correct offset for the date you pick.
- When it's 9:00 AM in St. Louis, it's 1:00 AM the next day in Sydney.
- When it's 9:00 AM in Sydney, it's 5:00 PM the previous day in St. Louis.
Sydney is currently 16 hours ahead of St. Louis.
Interactive converter
12:00PM
Select both cities to see the converted time.
Best times to meet
Standard 9 AM – 5 PM hours in St. Louis and Sydney do not overlap. The least-bad options are an early start in one city or a late evening call in the other — for example a 7–8 AM meeting in St. Louis, or a 6–8 PM meeting in Sydney.
Quick conversion table
| St. Louis | Sydney |
|---|---|
| 12 AM | 4:00 PM |
| 1 AM | 5:00 PM |
| 2 AM | 6:00 PM |
| 3 AM | 7:00 PM |
| 4 AM | 8:00 PM |
| 5 AM | 9:00 PM |
| 6 AM | 10:00 PM |
| 7 AM | 11:00 PM |
| 8 AM | 12:00 AM (next day) |
| 9 AM | 1:00 AM (next day) |
| 10 AM | 2:00 AM (next day) |
| 11 AM | 3:00 AM (next day) |
| 12 PM | 4:00 AM (next day) |
| 1 PM | 5:00 AM (next day) |
| 2 PM | 6:00 AM (next day) |
| 3 PM | 7:00 AM (next day) |
| 4 PM | 8:00 AM (next day) |
| 5 PM | 9:00 AM (next day) |
| 6 PM | 10:00 AM (next day) |
| 7 PM | 11:00 AM (next day) |
| 8 PM | 12:00 PM (next day) |
| 9 PM | 1:00 PM (next day) |
| 10 PM | 2:00 PM (next day) |
| 11 PM | 3:00 PM (next day) |
Daylight saving
On November 1, 2026, St. Louis shifts for daylight saving. After that, Sydney will be 17 hours ahead of St. Louis (currently 16 hours ahead of St. Louis). The converter and the tables above always reflect the correct offset for the date you pick.
- St. Louis is currently observing daylight saving time.
- Sydney is currently observing daylight saving time.
Frequently asked questions
- Is Sydney ahead of or behind St. Louis?
- Sydney is 16 hours ahead of St. Louis.
- How many hours ahead of St. Louis is Sydney?
- Sydney is 16 hours ahead of St. Louis.
- What time is 9 AM in St. Louis in Sydney?
- 9:00 AM in St. Louis is 1:00 AM the next day in Sydney.
- What time is noon in St. Louis in Sydney?
- 12:00 PM in St. Louis is 4:00 AM the next day in Sydney.
- What time is 5 PM in St. Louis in Sydney?
- 5:00 PM in St. Louis is 9:00 AM the next day in Sydney. Useful for end-of-day handoffs between the two offices.
- What time is 3 PM in St. Louis in Sydney?
- 3:00 PM in St. Louis is 7:00 AM the next day in Sydney.
- Is St. Louis currently observing daylight saving time?
- St. Louis is currently observing daylight saving time (summer time).
- Is Sydney currently observing daylight saving time?
- Sydney is currently observing daylight saving time (summer time).
- Do St. Louis and Sydney observe daylight saving?
- On November 1, 2026, St. Louis shifts for daylight saving. After that, Sydney will be 17 hours ahead of St. Louis (currently 16 hours ahead of St. Louis). The converter and the tables above always reflect the correct offset for the date you pick.
- When is the best time to call Sydney from St. Louis?
- St. Louis and Sydney business hours don't overlap. The closest options are early mornings in St. Louis or late evenings, when one side stretches outside 9–5.
- When is the best time to call St. Louis from Sydney?
- Sydney and St. Louis business hours don't overlap. The closest options are early mornings in Sydney or late evenings, when one side stretches outside 9–5.
- St. Louis (CDT) to Sydney (AEDT) — how do I convert quickly?
- Add 16 hours to St. Louis local time to get Sydney local time. Or use the converter at the top of this page — it stays accurate through daylight-saving changes automatically.
Other conversions
- New York to St. Louis
- London to St. Louis
- St. Louis to Tokyo
- Dubai to St. Louis
- Singapore to St. Louis
- Los Angeles to St. Louis
- Paris to St. Louis
- Mumbai to St. Louis
- Hong Kong to St. Louis
- San Francisco to St. Louis