San Francisco to Seoul Time Difference
Seoul is 16 hours ahead of San Francisco. When it's 05:57:46 AM in San Francisco, it's 09:57:46 PM in Seoul.
How Many Hours Ahead Is Seoul From San Francisco?
Seoul is 16 hours ahead of San Francisco. So San Francisco 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 San Francisco 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 San Francisco changes its clocks.
Best Time to Call San Francisco and Seoul
Standard 9-to-5 hours in San Francisco 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 San Francisco, which is 7:00 AM to 2:00 PM in Seoul.
both at work San Francisco only Seoul only neither — hours shown along the strip are San Francisco local time.
Convert a Specific Time
Pick any date and time in San Francisco to see the exact equivalent in Seoul.
Common Times Converted
San Francisco time on the left, Seoul time on the right.
San Francisco to Seoul: Full 24-Hour Conversion Table
Based on today, Sunday, October 11, 2026 in San Francisco. Shaded rows are working hours; the darker shade marks the hours when both cities are at work.
| San Francisco | 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 | San Francisco only |
| 10:00 AM | 2:00 AM next day | San Francisco only |
| 11:00 AM | 3:00 AM next day | San Francisco only |
| 12:00 PM | 4:00 AM next day | San Francisco only |
| 1:00 PM | 5:00 AM next day | San Francisco only |
| 2:00 PM | 6:00 AM next day | San Francisco only |
| 3:00 PM | 7:00 AM next day | San Francisco only |
| 4:00 PM | 8:00 AM next day | San Francisco 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 San Francisco – Seoul Time Difference
San Francisco 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.
San Francisco 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 San Francisco 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.
San Francisco today
Seoul today
Frequently Asked Questions
What is the time difference between San Francisco and Seoul?
Seoul is currently 16 hours ahead of San Francisco. That gap becomes 17 hours on Sunday, November 1, 2026, when San Francisco changes its clocks.
How many hours ahead is Seoul from San Francisco?
Seoul is 16 hours ahead of San Francisco. Looking at it the other way, San Francisco is 16 hours behind Seoul.
What time is it in Seoul when it is 9:00 AM in San Francisco?
When it is 9:00 AM in San Francisco, it is 1:00 AM the next day in Seoul.
Is Seoul ahead of or behind San Francisco?
Seoul is 16 hours ahead of San Francisco. Seoul reaches each point in the day first, so its working day is already finishing while San Francisco is still getting started.
What is the best time to call between San Francisco and Seoul?
Standard business hours in San Francisco 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 San Francisco, which is 7:00 AM to 2:00 PM in Seoul.
Does the time difference between San Francisco and Seoul change during the year?
Yes. San Francisco 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 San Francisco and Seoul in?
San Francisco uses the America/Los_Angeles time zone, currently PDT (UTC-7:00). Seoul uses Asia/Seoul, currently KST (UTC+9:00).