Sydney is 30 minutes to 1.5 hours ahead of Darwin. During AEST (winter), Sydney is 30 minutes ahead. During AEDT (summer), Sydney is 1.5 hours ahead. The Northern Territory doesn't observe DST.
Darwin uses ACST (UTC+9:30) year-round while Sydney switches between AEST/AEDT.
Business hours align reasonably well! The offset varies by season, so check the current difference. Darwin's proximity to Asia makes it a unique gateway.
Darwin and Sydney are connected by frequent 4.5-hour flights. Qantas, Virgin Australia, and Jetstar operate daily services.