Seoul is 18 hours ahead of Anchorage. Anchorage uses Alaska Time (AKST, UTC-9) while Seoul uses Korea Standard Time (KST, UTC+9). When it's 9:00 AM on Monday in Anchorage, it's 3:00 AM on Tuesday in Seoul.
Alaska observes daylight saving time but South Korea does not, so the difference varies between 17-18 hours throughout the year.
Best calling time: 2:00 PM - 5:00 PM Anchorage time. This corresponds to 8:00 AM - 11:00 AM the next day in Seoul, catching the start of the Korean business day.
Anchorage is a major refueling stop for flights between North America and Asia. Direct flights to Seoul take approximately 8 hours.