Guam is 1 hour ahead of Seoul. Guam uses Chamorro Standard Time (ChST, UTC+10) while Seoul uses Korea Standard Time (KST, UTC+9). When it's 12:00 PM in Guam, it's 11:00 AM in Seoul.
Neither location observes daylight saving time, so the time difference remains constant year-round.
Best calling time: 10:00 AM - 7:00 PM Guam time. This corresponds to 9:00 AM - 6:00 PM in Seoul, covering standard business hours.
Guam is a popular vacation destination for South Korean tourists. The flight takes about 4 hours. Many Korean businesses and restaurants operate in Guam to serve the tourist market.