Seattle to Sydney Time Difference
Sydney is 18 hours ahead of Seattle. When it's 09:27:15 AM in Seattle, it's 03:27:15 AM in Sydney.
How Many Hours Ahead Is Sydney From Seattle?
Sydney is 18 hours ahead of Seattle. So Seattle is 18 hours behind Sydney looking the other way — the same gap, described from the other end.
In practice that means a working day in Seattle starts when it is already 3:00 AM the next day in Sydney. The gap is not fixed all year: it becomes 19 hours on Sunday, November 1, 2026, when Seattle changes its clocks.
Best Time to Call Seattle and Sydney
Both cities are inside normal business hours between 3:00 PM and 5:00 PM in Seattle — that's 9:00 AM to 11:00 AM in Sydney. That's a 2-hour window, so a call fits comfortably in either side's working day.
both at work Seattle only Sydney only neither — hours shown along the strip are Seattle local time.
Convert a Specific Time
Pick any date and time in Seattle to see the exact equivalent in Sydney.
Common Times Converted
Seattle time on the left, Sydney time on the right.
Seattle to Sydney: Full 24-Hour Conversion Table
Based on today, Sunday, October 11, 2026 in Seattle. Shaded rows are working hours; the darker shade marks the hours when both cities are at work.
| Seattle | Sydney | Working hours |
|---|---|---|
| 12:00 AM | 6:00 PM | — |
| 1:00 AM | 7:00 PM | — |
| 2:00 AM | 8:00 PM | — |
| 3:00 AM | 9:00 PM | — |
| 4:00 AM | 10:00 PM | — |
| 5:00 AM | 11:00 PM | — |
| 6:00 AM | 12:00 AM next day | — |
| 7:00 AM | 1:00 AM next day | — |
| 8:00 AM | 2:00 AM next day | — |
| 9:00 AM | 3:00 AM next day | Seattle only |
| 10:00 AM | 4:00 AM next day | Seattle only |
| 11:00 AM | 5:00 AM next day | Seattle only |
| 12:00 PM | 6:00 AM next day | Seattle only |
| 1:00 PM | 7:00 AM next day | Seattle only |
| 2:00 PM | 8:00 AM next day | Seattle only |
| 3:00 PM | 9:00 AM next day | Both cities |
| 4:00 PM | 10:00 AM next day | Both cities |
| 5:00 PM | 11:00 AM next day | Sydney only |
| 6:00 PM | 12:00 PM next day | Sydney only |
| 7:00 PM | 1:00 PM next day | Sydney only |
| 8:00 PM | 2:00 PM next day | Sydney only |
| 9:00 PM | 3:00 PM next day | Sydney only |
| 10:00 PM | 4:00 PM next day | Sydney only |
| 11:00 PM | 5:00 PM next day | — |
Understanding the Seattle – Sydney Time Difference
Seattle runs on America/Los_Angeles, currently PDT (UTC-7:00). Sydney runs on Australia/Sydney, currently AEDT (UTC+11:00). The gap of 18 hours is simply the distance between those two offsets.
Both cities observe Daylight Saving Time, but they don't switch on the same date — so for a few weeks each year the gap between them is different again. The next shift is on Sunday, November 1, 2026, when Seattle adjusts its clocks and the difference becomes 19 hours. Anything scheduled across that date needs checking again.
Full clock-change dates: Daylight Saving Time in the United States · Daylight Saving Time in Australia.
Seattle today
Sydney today
Frequently Asked Questions
What is the time difference between Seattle and Sydney?
Sydney is currently 18 hours ahead of Seattle. That gap becomes 19 hours on Sunday, November 1, 2026, when Seattle changes its clocks.
How many hours ahead is Sydney from Seattle?
Sydney is 18 hours ahead of Seattle. Looking at it the other way, Seattle is 18 hours behind Sydney.
What time is it in Sydney when it is 9:00 AM in Seattle?
When it is 9:00 AM in Seattle, it is 3:00 AM the next day in Sydney.
Is Sydney ahead of or behind Seattle?
Sydney is 18 hours ahead of Seattle. Sydney reaches each point in the day first, so its working day is already finishing while Seattle is still getting started.
What is the best time to call between Seattle and Sydney?
Between 3:00 PM and 5:00 PM Seattle time, which is 9:00 AM to 11:00 AM in Sydney. Both cities are inside normal business hours during that window.
Does the time difference between Seattle and Sydney change during the year?
Yes. Both cities observe Daylight Saving Time, and they do not always switch on the same date, so the gap between them shifts during the year. It changes to 19 hours on Sunday, November 1, 2026.
What time zones are Seattle and Sydney in?
Seattle uses the America/Los_Angeles time zone, currently PDT (UTC-7:00). Sydney uses Australia/Sydney, currently AEDT (UTC+11:00).