Time difference
San Francisco to Seoul Time Difference
Seoul is 16 hours ahead of San Francisco — when it's 12:00 PM in San Francisco, it's 4:00 AM the next day in Seoul. (San Francisco (America/Los_Angeles, PDT); Seoul (Asia/Seoul, KST).) Below: live local times, the best hours for a call, a full conversion table, and exact daylight-saving dates.
Seoul is 16 hours ahead of San Francisco. Standard 9 AM–5 PM business hours in San Francisco and Seoul do not overlap, so a live call needs one side outside normal hours. Clocks change on November 1, 2026, which briefly shifts the gap between San Francisco and Seoul — the converter on this page always reflects the correct offset for the date you pick.
- When it's 9:00 AM in San Francisco, it's 1:00 AM the next day in Seoul.
- When it's 9:00 AM in Seoul, it's 5:00 PM the previous day in San Francisco.
Seoul is currently 16 hours ahead of San Francisco.
Interactive converter
12:00PM
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Best times to meet
Standard 9 AM – 5 PM hours in San Francisco and Seoul do not overlap. The least-bad options are an early start in one city or a late evening call in the other — for example a 7–8 AM meeting in San Francisco, or a 6–8 PM meeting in Seoul.
Quick conversion table
| San Francisco | Seoul |
|---|---|
| 12 AM | 4:00 PM |
| 1 AM | 5:00 PM |
| 2 AM | 6:00 PM |
| 3 AM | 7:00 PM |
| 4 AM | 8:00 PM |
| 5 AM | 9:00 PM |
| 6 AM | 10:00 PM |
| 7 AM | 11:00 PM |
| 8 AM | 12:00 AM (next day) |
| 9 AM | 1:00 AM (next day) |
| 10 AM | 2:00 AM (next day) |
| 11 AM | 3:00 AM (next day) |
| 12 PM | 4:00 AM (next day) |
| 1 PM | 5:00 AM (next day) |
| 2 PM | 6:00 AM (next day) |
| 3 PM | 7:00 AM (next day) |
| 4 PM | 8:00 AM (next day) |
| 5 PM | 9:00 AM (next day) |
| 6 PM | 10:00 AM (next day) |
| 7 PM | 11:00 AM (next day) |
| 8 PM | 12:00 PM (next day) |
| 9 PM | 1:00 PM (next day) |
| 10 PM | 2:00 PM (next day) |
| 11 PM | 3:00 PM (next day) |
Daylight saving
On November 1, 2026, San Francisco shifts for daylight saving. After that, Seoul will be 17 hours ahead of San Francisco (currently 16 hours ahead of San Francisco). The converter and the tables above always reflect the correct offset for the date you pick.
- San Francisco is currently observing daylight saving time.
- Seoul does not observe daylight saving time.
Frequently asked questions
- Is Seoul ahead of or behind San Francisco?
- Seoul is 16 hours ahead of San Francisco.
- How many hours ahead of San Francisco is Seoul?
- Seoul is 16 hours ahead of San Francisco.
- What time is 9 AM in San Francisco in Seoul?
- 9:00 AM in San Francisco is 1:00 AM the next day in Seoul.
- What time is noon in San Francisco in Seoul?
- 12:00 PM in San Francisco is 4:00 AM the next day in Seoul.
- What time is 5 PM in San Francisco in Seoul?
- 5:00 PM in San Francisco is 9:00 AM the next day in Seoul. Useful for end-of-day handoffs between the two offices.
- What time is 3 PM in San Francisco in Seoul?
- 3:00 PM in San Francisco is 7:00 AM the next day in Seoul.
- Is San Francisco currently observing daylight saving time?
- San Francisco is currently observing daylight saving time (summer time).
- Is Seoul currently observing daylight saving time?
- Seoul does not observe daylight saving time — its UTC offset stays the same all year.
- Do San Francisco and Seoul observe daylight saving?
- On November 1, 2026, San Francisco shifts for daylight saving. After that, Seoul will be 17 hours ahead of San Francisco (currently 16 hours ahead of San Francisco). The converter and the tables above always reflect the correct offset for the date you pick.
- When is the best time to call Seoul from San Francisco?
- San Francisco and Seoul business hours don't overlap. The closest options are early mornings in San Francisco or late evenings, when one side stretches outside 9–5.
- When is the best time to call San Francisco from Seoul?
- Seoul and San Francisco business hours don't overlap. The closest options are early mornings in Seoul or late evenings, when one side stretches outside 9–5.
- San Francisco (PDT) to Seoul (KST) — how do I convert quickly?
- Add 16 hours to San Francisco local time to get Seoul local time. Or use the converter at the top of this page — it stays accurate through daylight-saving changes automatically.
Other conversions
- New York to San Francisco
- London to San Francisco
- San Francisco to Tokyo
- Dubai to San Francisco
- San Francisco to Singapore
- Los Angeles to San Francisco
- San Francisco to Sydney
- Paris to San Francisco
- Mumbai to San Francisco
- Hong Kong to San Francisco