Seoul to San Diego Time Difference
San Diego is 16 hours behind Seoul. When it's 11:20:16 PM in Seoul, it's 07:20:16 AM in San Diego.
How Many Hours Behind Is San Diego From Seoul?
San Diego is 16 hours behind Seoul. So Seoul is 16 hours ahead of San Diego looking the other way — the same gap, described from the other end.
In practice that means a working day in Seoul starts when it is already 5:00 PM the previous day in San Diego. The gap is not fixed all year: it becomes 17 hours on Sunday, November 1, 2026, when San Diego changes its clocks.
Best Time to Call Seoul and San Diego
Standard 9-to-5 hours in Seoul and San Diego never overlap, so someone has to take the call outside their working day. The most workable window is 7:00 AM to 2:00 PM in Seoul, which is 3:00 PM to 10:00 PM in San Diego.
both at work Seoul only San Diego only neither — hours shown along the strip are Seoul local time.
Convert a Specific Time
Pick any date and time in Seoul to see the exact equivalent in San Diego.
Common Times Converted
Seoul time on the left, San Diego time on the right.
Seoul to San Diego: Full 24-Hour Conversion Table
Based on today, Sunday, October 11, 2026 in Seoul. Shaded rows are working hours; the darker shade marks the hours when both cities are at work.
| Seoul | San Diego | Working hours |
|---|---|---|
| 12:00 AM | 8:00 AM prev day | — |
| 1:00 AM | 9:00 AM prev day | San Diego only |
| 2:00 AM | 10:00 AM prev day | San Diego only |
| 3:00 AM | 11:00 AM prev day | San Diego only |
| 4:00 AM | 12:00 PM prev day | San Diego only |
| 5:00 AM | 1:00 PM prev day | San Diego only |
| 6:00 AM | 2:00 PM prev day | San Diego only |
| 7:00 AM | 3:00 PM prev day | San Diego only |
| 8:00 AM | 4:00 PM prev day | San Diego only |
| 9:00 AM | 5:00 PM prev day | Seoul only |
| 10:00 AM | 6:00 PM prev day | Seoul only |
| 11:00 AM | 7:00 PM prev day | Seoul only |
| 12:00 PM | 8:00 PM prev day | Seoul only |
| 1:00 PM | 9:00 PM prev day | Seoul only |
| 2:00 PM | 10:00 PM prev day | Seoul only |
| 3:00 PM | 11:00 PM prev day | Seoul only |
| 4:00 PM | 12:00 AM | Seoul only |
| 5:00 PM | 1:00 AM | — |
| 6:00 PM | 2:00 AM | — |
| 7:00 PM | 3:00 AM | — |
| 8:00 PM | 4:00 AM | — |
| 9:00 PM | 5:00 AM | — |
| 10:00 PM | 6:00 AM | — |
| 11:00 PM | 7:00 AM | — |
Understanding the Seoul – San Diego Time Difference
Seoul runs on Asia/Seoul, currently KST (UTC+9:00). San Diego runs on America/Los_Angeles, currently PDT (UTC-7:00). The gap of 16 hours is simply the distance between those two offsets.
San Diego 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 Diego 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.
Seoul today
San Diego today
Frequently Asked Questions
What is the time difference between Seoul and San Diego?
San Diego is currently 16 hours behind Seoul. That gap becomes 17 hours on Sunday, November 1, 2026, when San Diego changes its clocks.
How many hours behind is San Diego from Seoul?
San Diego is 16 hours behind Seoul. Looking at it the other way, Seoul is 16 hours ahead of San Diego.
What time is it in San Diego when it is 9:00 AM in Seoul?
When it is 9:00 AM in Seoul, it is 5:00 PM the previous day in San Diego.
Is San Diego ahead of or behind Seoul?
San Diego is 16 hours behind Seoul. Seoul reaches each point in the day first, so San Diego is still getting started while the Seoul working day is finishing.
What is the best time to call between Seoul and San Diego?
Standard business hours in Seoul and San Diego do not overlap at all, so one side has to step outside the 9-to-5. The most workable window is 7:00 AM to 2:00 PM in Seoul, which is 3:00 PM to 10:00 PM in San Diego.
Does the time difference between Seoul and San Diego change during the year?
Yes. San Diego 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 Seoul and San Diego in?
Seoul uses the Asia/Seoul time zone, currently KST (UTC+9:00). San Diego uses America/Los_Angeles, currently PDT (UTC-7:00).