Seattle to Seoul Time Difference
Seoul is 16 hours ahead of Seattle. When it's 05:55:58 AM in Seattle, it's 09:55:58 PM in Seoul.
How Many Hours Ahead Is Seoul From Seattle?
Seoul is 16 hours ahead of Seattle. So Seattle is 16 hours behind Seoul 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 1:00 AM the next day in Seoul. The gap is not fixed all year: it becomes 17 hours on Sunday, November 1, 2026, when Seattle changes its clocks.
Best Time to Call Seattle and Seoul
Standard 9-to-5 hours in Seattle and Seoul never overlap, so someone has to take the call outside their working day. The most workable window is 3:00 PM to 10:00 PM in Seattle, which is 7:00 AM to 2:00 PM in Seoul.
both at work Seattle only Seoul 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 Seoul.
Common Times Converted
Seattle time on the left, Seoul time on the right.
Seattle to Seoul: 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 | Seoul | Working hours |
|---|---|---|
| 12:00 AM | 4:00 PM | Seoul only |
| 1:00 AM | 5:00 PM | — |
| 2:00 AM | 6:00 PM | — |
| 3:00 AM | 7:00 PM | — |
| 4:00 AM | 8:00 PM | — |
| 5:00 AM | 9:00 PM | — |
| 6:00 AM | 10:00 PM | — |
| 7:00 AM | 11:00 PM | — |
| 8:00 AM | 12:00 AM next day | — |
| 9:00 AM | 1:00 AM next day | Seattle only |
| 10:00 AM | 2:00 AM next day | Seattle only |
| 11:00 AM | 3:00 AM next day | Seattle only |
| 12:00 PM | 4:00 AM next day | Seattle only |
| 1:00 PM | 5:00 AM next day | Seattle only |
| 2:00 PM | 6:00 AM next day | Seattle only |
| 3:00 PM | 7:00 AM next day | Seattle only |
| 4:00 PM | 8:00 AM next day | Seattle only |
| 5:00 PM | 9:00 AM next day | Seoul only |
| 6:00 PM | 10:00 AM next day | Seoul only |
| 7:00 PM | 11:00 AM next day | Seoul only |
| 8:00 PM | 12:00 PM next day | Seoul only |
| 9:00 PM | 1:00 PM next day | Seoul only |
| 10:00 PM | 2:00 PM next day | Seoul only |
| 11:00 PM | 3:00 PM next day | Seoul only |
Understanding the Seattle – Seoul Time Difference
Seattle runs on America/Los_Angeles, currently PDT (UTC-7:00). Seoul runs on Asia/Seoul, currently KST (UTC+9:00). The gap of 16 hours is simply the distance between those two offsets.
Seattle observes Daylight Saving Time and Seoul does not, so the gap between them shifts by an hour twice a year. The next shift is on Sunday, November 1, 2026, when Seattle adjusts its clocks and the difference becomes 17 hours. Anything scheduled across that date needs checking again.
Full clock-change dates: Daylight Saving Time in the United States.
Seattle today
Seoul today
Frequently Asked Questions
What is the time difference between Seattle and Seoul?
Seoul is currently 16 hours ahead of Seattle. That gap becomes 17 hours on Sunday, November 1, 2026, when Seattle changes its clocks.
How many hours ahead is Seoul from Seattle?
Seoul is 16 hours ahead of Seattle. Looking at it the other way, Seattle is 16 hours behind Seoul.
What time is it in Seoul when it is 9:00 AM in Seattle?
When it is 9:00 AM in Seattle, it is 1:00 AM the next day in Seoul.
Is Seoul ahead of or behind Seattle?
Seoul is 16 hours ahead of Seattle. Seoul 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 Seoul?
Standard business hours in Seattle and Seoul do not overlap at all, so one side has to step outside the 9-to-5. The most workable window is 3:00 PM to 10:00 PM in Seattle, which is 7:00 AM to 2:00 PM in Seoul.
Does the time difference between Seattle and Seoul change during the year?
Yes. Seattle observes Daylight Saving Time and Seoul does not, so the gap between them shifts during the year. It changes to 17 hours on Sunday, November 1, 2026.
What time zones are Seattle and Seoul in?
Seattle uses the America/Los_Angeles time zone, currently PDT (UTC-7:00). Seoul uses Asia/Seoul, currently KST (UTC+9:00).