Time Difference: San Francisco to Seoul
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San Francisco vs Seoul timezone guide
San Francisco (US) uses the America/Los_Angeles timezone at UTC-8, while Seoul (South Korea) uses Asia/Seoul at UTC+9. This means Seoul is 17 hours ahead of San Francisco (based on standard offsets — the live difference above accounts for daylight saving time).
Best meeting times between San Francisco and Seoul
Standard 9-to-5 working hours in San Francisco and Seoul do not overlap. To meet synchronously, one side will need to start early or stay late — see the hour-by-hour planner below for the least disruptive options.
Hour-by-hour planner
| San Francisco | Seoul | Status |
|---|---|---|
| 6am | 10pm | San Francisco early, Seoul late evening |
| 7am | 11pm | San Francisco early, Seoul late evening |
| 8am | 12am | San Francisco early, Seoul asleep |
| 9am | 1am | San Francisco working hours, Seoul asleep |
| 10am | 2am | San Francisco working hours, Seoul asleep |
| 11am | 3am | San Francisco working hours, Seoul asleep |
| 12pm | 4am | San Francisco working hours, Seoul asleep |
| 1pm | 5am | San Francisco working hours, Seoul asleep |
| 2pm | 6am | One side outside 9-to-5 but still awake |
| 3pm | 7am | One side outside 9-to-5 but still awake |
| 4pm | 8am | One side outside 9-to-5 but still awake |
| 5pm | 9am | One side outside 9-to-5 but still awake |
| 6pm | 10am | One side outside 9-to-5 but still awake |
| 7pm | 11am | One side outside 9-to-5 but still awake |
| 8pm | 12pm | One side outside 9-to-5 but still awake |
| 9pm | 1pm | One side outside 9-to-5 but still awake |
| 10pm | 2pm | San Francisco late evening, Seoul working hours |
Green = standard working hours (9 AM – 5 PM). Amber = early (6–9 AM). Orange = evening (5–10 PM). Grey = asleep or late.
Daylight saving time between San Francisco and Seoul
San Francisco observes daylight saving time, but Seoul does not. That means the difference between the two cities changes seasonally — by one hour, around San Francisco's transition dates.
- Dec 31 → Mar 8San Francisco is 17 hours behind Seoul
- Mar 8 → Nov 1San Francisco is 16 hours behind Seoul
- Nov 1 → Dec 31San Francisco is 17 hours behind Seoul
Distance between San Francisco and Seoul
San Francisco and Seoul are 9,029 km apart along the great-circle route. A direct flight takes roughly ~11h 37m, depending on aircraft type, winds, and routing.