Sydney to Seattle Time Difference
Seattle is 18 hours behind Sydney. When it's 03:27:15 AM in Sydney, it's 09:27:15 AM in Seattle.
How Many Hours Behind Is Seattle From Sydney?
Seattle is 18 hours behind Sydney. So Sydney is 18 hours ahead of Seattle looking the other way — the same gap, described from the other end.
In practice that means a working day in Sydney starts when it is already 3:00 PM the previous day in Seattle. 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 Sydney and Seattle
Both cities are inside normal business hours between 9:00 AM and 11:00 AM in Sydney — that's 3:00 PM to 5:00 PM in Seattle. That's a 2-hour window, so a call fits comfortably in either side's working day.
both at work Sydney only Seattle only neither — hours shown along the strip are Sydney local time.
Convert a Specific Time
Pick any date and time in Sydney to see the exact equivalent in Seattle.
Common Times Converted
Sydney time on the left, Seattle time on the right.
Sydney to Seattle: Full 24-Hour Conversion Table
Based on today, Monday, October 12, 2026 in Sydney. Shaded rows are working hours; the darker shade marks the hours when both cities are at work.
| Sydney | Seattle | Working hours |
|---|---|---|
| 12:00 AM | 6:00 AM prev day | — |
| 1:00 AM | 7:00 AM prev day | — |
| 2:00 AM | 8:00 AM prev day | — |
| 3:00 AM | 9:00 AM prev day | Seattle only |
| 4:00 AM | 10:00 AM prev day | Seattle only |
| 5:00 AM | 11:00 AM prev day | Seattle only |
| 6:00 AM | 12:00 PM prev day | Seattle only |
| 7:00 AM | 1:00 PM prev day | Seattle only |
| 8:00 AM | 2:00 PM prev day | Seattle only |
| 9:00 AM | 3:00 PM prev day | Both cities |
| 10:00 AM | 4:00 PM prev day | Both cities |
| 11:00 AM | 5:00 PM prev day | Sydney only |
| 12:00 PM | 6:00 PM prev day | Sydney only |
| 1:00 PM | 7:00 PM prev day | Sydney only |
| 2:00 PM | 8:00 PM prev day | Sydney only |
| 3:00 PM | 9:00 PM prev day | Sydney only |
| 4:00 PM | 10:00 PM prev day | Sydney only |
| 5:00 PM | 11:00 PM prev day | — |
| 6:00 PM | 12:00 AM | — |
| 7:00 PM | 1:00 AM | — |
| 8:00 PM | 2:00 AM | — |
| 9:00 PM | 3:00 AM | — |
| 10:00 PM | 4:00 AM | — |
| 11:00 PM | 5:00 AM | — |
Understanding the Sydney – Seattle Time Difference
Sydney runs on Australia/Sydney, currently AEDT (UTC+11:00). Seattle runs on America/Los_Angeles, currently PDT (UTC-7:00). 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 Australia · Daylight Saving Time in the United States.
Sydney today
Seattle today
Frequently Asked Questions
What is the time difference between Sydney and Seattle?
Seattle is currently 18 hours behind Sydney. That gap becomes 19 hours on Sunday, November 1, 2026, when Seattle changes its clocks.
How many hours behind is Seattle from Sydney?
Seattle is 18 hours behind Sydney. Looking at it the other way, Sydney is 18 hours ahead of Seattle.
What time is it in Seattle when it is 9:00 AM in Sydney?
When it is 9:00 AM in Sydney, it is 3:00 PM the previous day in Seattle.
Is Seattle ahead of or behind Sydney?
Seattle is 18 hours behind Sydney. Sydney reaches each point in the day first, so Seattle is still getting started while the Sydney working day is finishing.
What is the best time to call between Sydney and Seattle?
Between 9:00 AM and 11:00 AM Sydney time, which is 3:00 PM to 5:00 PM in Seattle. Both cities are inside normal business hours during that window.
Does the time difference between Sydney and Seattle 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 Sydney and Seattle in?
Sydney uses the Australia/Sydney time zone, currently AEDT (UTC+11:00). Seattle uses America/Los_Angeles, currently PDT (UTC-7:00).