Live Synchronized Time Difference
San FranciscotoSeoulTime Difference
🇺🇸
San Francisco
United States (PDT)08:10:20UTC-7:00
🇰🇷
Seoul
South Korea (GMT+9)00:10:20UTC+9:00
Direct Distance9,029 km (5,610 miles)
Estimated Flight Time~11.1 hours
Business Overlap0 overlapping hours (9am–5pm)
Feasible Shoulder Hours Window
Recommended calling window between San Francisco and Seoul
Off-Peak Calling Window
San Francisco Time
3:00 PM – 9:00 PM
Seoul Time
7:00 AM – 1:00 PM
There are no overlapping 9-to-5 working hours between San Francisco and Seoul. The optimal compromise window falls during morning/evening shoulder periods (7:00 AM – 9:00 PM) when participants in both locations are awake.
24-Hour Schedule Conversion Matrix
Compare every hour of the day between San Francisco and Seoul.
Work (9am-5pm)ShoulderSleep / Off
| San Francisco Time (United States) | Seoul Time (South Korea) | Status & Recommendation |
|---|---|---|
| 00:00AM | 16:00PM | ⚪ Outside Work Hours |
| 01:00AM | 17:00PM | ⚪ Outside Work Hours |
| 02:00AM | 18:00PM | ⚪ Outside Work Hours |
| 03:00AM | 19:00PM | ⚪ Outside Work Hours |
| 04:00AM | 20:00PM | ⚪ Outside Work Hours |
| 05:00AM | 21:00PM | ⚪ Outside Work Hours |
| 06:00AM | 22:00PM | ⚪ Outside Work Hours |
| 07:00AM | 23:00PM | ⚪ Outside Work Hours |
| 08:00AM | 00:00AM | ⚪ Outside Work Hours |
| 09:00AM | 01:00AM | ⚪ Outside Work Hours |
| 10:00AM | 02:00AM | ⚪ Outside Work Hours |
| 11:00AM | 03:00AM | ⚪ Outside Work Hours |
| 12:00PM | 04:00AM | ⚪ Outside Work Hours |
| 13:00PM | 05:00AM | ⚪ Outside Work Hours |
| 14:00PM | 06:00AM | ⚪ Outside Work Hours |
| 15:00PM | 07:00AM | 🟡 Feasible (Shoulder Hour) |
| 16:00PM | 08:00AM | 🟡 Feasible (Shoulder Hour) |
| 17:00PM | 09:00AM | ⚪ Outside Work Hours |
| 18:00PM | 10:00AM | ⚪ Outside Work Hours |
| 19:00PM | 11:00AM | ⚪ Outside Work Hours |
| 20:00PM | 12:00PM | ⚪ Outside Work Hours |
| 21:00PM | 13:00PM | ⚪ Outside Work Hours |
| 22:00PM | 14:00PM | ⚪ Outside Work Hours |
| 23:00PM | 15:00PM | ⚪ Outside Work Hours |
Frequently Asked Questions
What is the time difference between San Francisco and Seoul?
Seoul is 16 hours ahead of San Francisco.
What is the best time to schedule a cross-border meeting between San Francisco and Seoul?
Because of the wide timezone separation, a compromise meeting window during early morning in one location and evening in the other is recommended.
Does daylight saving time (DST) affect the time difference between San Francisco and Seoul?
Yes. If either United States or South Korea observes seasonal Daylight Saving Time transitions, the offset difference shifts by one hour on scheduled transition dates.