Sydney is always 30 minutes ahead of Adelaide. When it's 9:00 AM in Adelaide, it's 9:30 AM in Sydney. Both cities observe DST on the same schedule, maintaining the 30-minute difference year-round.
Adelaide uses ACST/ACDT (UTC+9:30/+10:30) while Sydney uses AEST/AEDT (UTC+10/+11).
Business hours align almost perfectly! The 30-minute offset is minimal, making scheduling very easy between South Australia and NSW.
Adelaide and Sydney are connected by frequent 2-hour flights. Qantas, Virgin Australia, and Jetstar operate multiple daily services.