Seoul is 17 hours ahead of Portland during standard time (or 16 hours during PDT). Portland uses Pacific Time (PT, UTC-8/-7) while Seoul uses Korea Standard Time (KST, UTC+9). When it's 12:00 PM in Portland, it's 5:00 AM the next day in Seoul.
South Korea does not observe daylight saving time, so the difference varies between 16 and 17 hours depending on whether Portland is on PST or PDT.
Best calling time: 4:00 PM - 6:00 PM Portland time. This corresponds to 9:00 AM - 11:00 AM the next day in Seoul, catching Korean morning business hours.
Portland has a significant Korean-American community and strong trade ties with South Korea. Korean tech companies and Portland's tech sector have growing connections. Direct flights from Seattle (nearby) to Seoul take about 11 hours.