Live Synchronized Time Difference
SeoultoSan FranciscoTime Difference
🇰🇷
Seoul
South Korea (GMT+9)00:10:22UTC+9:00
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San Francisco
United States (PDT)08:10:22UTC-7:00
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 Seoul and San Francisco
Off-Peak Calling Window
Seoul Time
7:00 AM – 1:00 PM
San Francisco Time
3:00 PM – 9:00 PM
There are no overlapping 9-to-5 working hours between Seoul and San Francisco. 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 Seoul and San Francisco.
Work (9am-5pm)ShoulderSleep / Off
| Seoul Time (South Korea) | San Francisco Time (United States) | Status & Recommendation |
|---|---|---|
| 00:00AM | 08:00AM-1 day | ⚪ Outside Work Hours |
| 01:00AM | 09:00AM-1 day | ⚪ Outside Work Hours |
| 02:00AM | 10:00AM-1 day | ⚪ Outside Work Hours |
| 03:00AM | 11:00AM-1 day | ⚪ Outside Work Hours |
| 04:00AM | 12:00PM-1 day | ⚪ Outside Work Hours |
| 05:00AM | 13:00PM-1 day | ⚪ Outside Work Hours |
| 06:00AM | 14:00PM-1 day | ⚪ Outside Work Hours |
| 07:00AM | 15:00PM-1 day | ⚪ Outside Work Hours |
| 08:00AM | 16:00PM-1 day | ⚪ Outside Work Hours |
| 09:00AM | 17:00PM-1 day | 🟡 Feasible (Shoulder Hour) |
| 10:00AM | 18:00PM-1 day | 🟡 Feasible (Shoulder Hour) |
| 11:00AM | 19:00PM-1 day | 🟡 Feasible (Shoulder Hour) |
| 12:00PM | 20:00PM-1 day | 🟡 Feasible (Shoulder Hour) |
| 13:00PM | 21:00PM-1 day | ⚪ Outside Work Hours |
| 14:00PM | 22:00PM-1 day | ⚪ Outside Work Hours |
| 15:00PM | 23:00PM-1 day | ⚪ Outside Work Hours |
| 16:00PM | 00:00AM | ⚪ Outside Work Hours |
| 17:00PM | 01:00AM | ⚪ Outside Work Hours |
| 18:00PM | 02:00AM | ⚪ Outside Work Hours |
| 19:00PM | 03:00AM | ⚪ Outside Work Hours |
| 20:00PM | 04:00AM | ⚪ Outside Work Hours |
| 21:00PM | 05:00AM | ⚪ Outside Work Hours |
| 22:00PM | 06:00AM | ⚪ Outside Work Hours |
| 23:00PM | 07:00AM | ⚪ Outside Work Hours |
Frequently Asked Questions
What is the time difference between Seoul and San Francisco?
San Francisco is 16 hours behind Seoul.
What is the best time to schedule a cross-border meeting between Seoul and San Francisco?
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 Seoul and San Francisco?
Yes. If either South Korea or United States observes seasonal Daylight Saving Time transitions, the offset difference shifts by one hour on scheduled transition dates.