Time Difference Between Seoul and Philadelphia

The time difference between Seoul and Philadelphia is 13 hours. When it is 12:00 noon in Seoul, it is 23:00 in Philadelphia. Seoul uses the Asia/Seoul time zone (UTC+9), while Philadelphia uses America/New_York (UTC-4).

Time Zone Details: Seoul vs Philadelphia

Best Time to Schedule a Call

With a 13 hours gap, there is no standard business-hours overlap between Seoul and Philadelphia. One party will need to adjust their schedule. Early mornings in Seoul or late evenings in Philadelphia tend to be the most practical compromise.

Hour-by-Hour Time Conversion

Use this table to quickly convert any hour from Seoul time to Philadelphia time. Rows highlighted in green indicate overlapping business hours in both cities.

Daylight Saving Time (DST) Impact

Philadelphia is currently observing daylight saving time, while Seoul is on standard time. When Philadelphia switches back to standard time, the difference between these two cities will shift by 1 hour.

Practical Tips for Seoul–Philadelphia Scheduling

• Video calls: Rotate call times between early-morning and late-evening slots to share the scheduling burden fairly.
• Email and async work: Send messages at the end of your workday so they arrive at the start of theirs. With a 13 hours offset, replies will often land by your next morning.
• Flight arrivals: A direct flight between these cities can cross 13 time zones. Factor in jet lag recovery — most travelers need roughly one day per hour of time difference to fully adjust.
• Use UTC as a neutral reference when coordinating with three or more time zones at once.

Compare Seoul and Philadelphia with Other Cities

From Seoul

From Philadelphia

Frequently Asked Questions

What is the time difference between Seoul and Philadelphia?

The time difference is 13 hours. Philadelphia is 13 hours behind Seoul.

Does the time difference change during the year?

Yes. One of these cities observes DST while the other does not, so the difference shifts by 1 hour when DST begins or ends.

When is the best time to call from Seoul to Philadelphia?

There is no ideal window during standard business hours. Consider scheduling at the edges — early morning for the city that is ahead and late afternoon for the city that is behind.

How do I convert Seoul time to Philadelphia time?

Subtract 13 hours from Seoul time to get Philadelphia time. Use the hour-by-hour table above for a quick reference.

Related Pages

• Current time in Seoul — live clock, time zone details, DST status
• Current time in Philadelphia — live clock, time zone details, DST status
• Time Difference Calculator — compare any two cities
• UTC+9 countries and cities
• UTC-4 countries and cities
• Current UTC Time
• All World Time Zones
• What Is a Time Zone?

For sunrise and sunset data, visit TheSunsetTimes.com. For detailed DST schedules, see DaylightSavingTime.info.