There is no time difference between Busan and Fukuoka. Both cities use UTC+9. Busan uses Korea Standard Time (KST) and Fukuoka uses Japan Standard Time (JST). When it's 9:00 AM in Busan, it's also 9:00 AM in Fukuoka.
Neither city observes daylight saving time, so they remain synchronized year-round.
Any time works! Since both cities share the same timezone, you can schedule calls during standard business hours (9:00 AM - 6:00 PM) without any time conversion needed.
Busan and Fukuoka are the closest major cities between Korea and Japan, separated by only about 200 km across the Korea Strait. High-speed ferries connect the cities in about 3 hours.