Best Meeting Time: Seoul to Sydney

Seoul and Sydney sit just one hour apart for most of the year, which sounds simple until Sydney shifts to AEDT and the gap temporarily disappears. With eight hours of working-day overlap, teams in Seoul and Sydney have more room to schedule than almost any other major Asia-Pacific pairing. The real challenge is tracking which direction Sydney has moved on any given week.

Working Across Seoul and Sydney

South Korea and Australia have a substantial trade relationship built around resources, technology, and financial services. Korean steelmakers, shipbuilders, and electronics manufacturers import Australian iron ore, coal, and liquefied natural gas, meaning procurement, logistics, and contract teams in Seoul regularly need to reach counterparts in Sydney. The Korean automotive and battery sectors have been expanding in Australia, adding supplier-side conversations to the mix. On the financial side, fund managers in Sydney who run Asia-Pacific mandates monitor Korean equities on the Korea Exchange, which opens at 9am KST. Korean firms listed on the ASX, or Australian funds with Seoul-based IR contacts, are another steady source of cross-city calls. The technology sector adds its own layer: Korean platform companies, gaming studios, and semiconductor firms have regional offices or partners in Sydney, and Australian software and fintech companies increasingly target Seoul as a gateway to the broader Korean market. At the office level, Seoul workplaces often run longer hours in practice than the legal 52-hour cap suggests, and Friday evenings are typically off-limits for meetings given the culture of team dinners. Sydney offices tend to clear out promptly at the end of the day and run on reduced staff through the Christmas-to-Australia Day window in late December and January.

Time Difference: Seoul and Sydney

Sydney is currently 1 hour ahead of Seoul. The live offsets are Seoul UTC+9 and Sydney UTC+10. Seoul does not observe daylight saving and Sydney observes daylight saving, so the offset shifts twice a year if both sides aren't already aligned.

Seoul runs UTC+9 all year. South Korea does not observe daylight saving time, so the Seoul offset never moves. Sydney observes Australian Eastern Daylight Time (AEDT, UTC+11) from the first Sunday in October through to the first Sunday in April, then reverts to AEST (UTC+10) for the southern-hemisphere winter. During AEST, Sydney leads Seoul by one hour. When Sydney moves to AEDT in October, that gap narrows to zero: the two cities share the same wall-clock time. A 10am call in Seoul is a 10am call in Sydney during AEDT. When Sydney returns to AEST in April, the one-hour lead is restored. There is no DST changeover to manage on the Seoul side. The practical risk is the changeover weekend itself in October and April, when anyone relying on a calendar invite set to a fixed UTC time may find the Sydney local time has shifted by an hour relative to the previous week.

Best Times to Meet

Seoul's working day runs 9am to 6pm KST. Sydney's corresponding window is 10am to 7pm AEST, or 9am to 6pm AEDT when clocks are forward. The overlap the two cities share is eight hours: 9am to 5pm in Seoul aligns with 10am to 6pm in Sydney under AEST, and 9am to 5pm Seoul aligns with 9am to 5pm Sydney under AEDT. The cleanest slot inside that eight-hour window is 10am to 12pm Seoul time. At that point, Seoul is mid-morning with the day settled, and Sydney is either 11am to 1pm (AEST) or 10am to 12pm (AEDT), comfortably past the open. Late afternoon in Seoul, around 4pm to 5pm KST, still works for Sydney since it lands at 5pm to 6pm AEST, catching the Sydney team before close. Avoid scheduling on the Seoul side after 5pm, since that pushes Sydney past 6pm and into evening. Friday afternoons in Seoul are better left free given the common hoesik pattern.

These conversions use the standard AEST offset of UTC+10. During AEDT (October to April), add one further hour to the Sydney time shown. 9am Tuesday in Seoul (KST, UTC+9) = 10am Tuesday in Sydney (AEST, UTC+10). Both cities, same calendar day. 12pm Tuesday in Seoul = 1pm Tuesday in Sydney (AEST). A midday Seoul call lands at lunch in Sydney, so confirm Sydney participants are available before booking. 5pm Tuesday in Seoul = 6pm Tuesday in Sydney (AEST). Seoul end-of-day reaches Sydney right at close. During AEDT, that same 5pm Seoul slot becomes 6pm Sydney, which is outside standard hours.

Working Hours Overlap Explained

Seoul operates on Asia/Seoul (currently UTC+9). Sydney operates on Australia/Sydney (currently UTC+10). The table below maps a standard 9:00 AM–6:00 PM day in Seoul to Sydney's local time.

Tips for Scheduling Across Seoul and Sydney

• Seoul never changes its clocks. Every offset shift on this route comes from Sydney alone, so put the adjustment burden on the Sydney-side calendar.
• During AEDT, Seoul and Sydney share the same wall clock time. A 2pm in Seoul is a 2pm in Sydney, which simplifies invites for that half of the year.
• Avoid booking Seoul meetings on Friday after 4pm. The hoesik dinner culture means late-Friday calls are likely to conflict with team commitments.
• Sydney offices run on skeleton staff from around Christmas Day to Australia Day on 26 January. Confirm attendance for any Seoul-Sydney call in that window.
• Seollal and Chuseok each close Seoul for three to four days. Both holidays fall on movable dates, so check the Korean calendar each year before setting quarterly schedules.

Public Holidays and Working Weeks

Seoul's working week follows Monday to Friday, with 9am to 6pm as the stated pattern, though many firms extend hours in practice. Friday evenings are largely reserved for hoesik, the team dinner tradition, so scheduling a cross-city call late on a Friday in Seoul is likely to create friction. Sydney runs the same Monday-to-Friday structure, with offices generally observing a firm end of day. The period from mid-November through to late January is summer holiday season in Sydney, and between Christmas Day (25 December) and Australia Day (26 January), many Sydney offices operate with skeleton staff or close entirely. Anyone in Seoul trying to run a project through that window should confirm Sydney-side availability well in advance. On the Korean calendar, Seollal (Lunar New Year) and Chuseok each bring three to four days of national closure, typically falling in January or February and September or October respectively. Liberation Day on 15 August is a further public holiday in Seoul. Australia's ANZAC Day on 25 April falls in the same month that Sydney reverts to AEST, so that first week of April and late April carry both a DST change and a public holiday to track. Aligning both holiday calendars at the start of a quarter prevents last-minute rescheduling.

Recommended Scheduling Tools

Some links are affiliate links. We only recommend tools we'd use ourselves. They don't cost you anything extra.

Related City Pairs

Frequently Asked Questions