New Zealand is a single country — not a group of "NZ countries." The closest NZ city to Perth, Western Australia is Auckland.
Perth (PER) → Auckland (AKL): 5,750 km (3,570 mi).
Flight time: 7h 30m direct (Air New Zealand, seasonal) or 9-12h via Sydney/Melbourne/Kuala Lumpur.
Time difference: NZST (UTC+12) vs AWST (UTC+8) = 4 hours (5 hrs NZDT).
Christchurch: 6,100 km. Wellington: 6,000 km. Queenstown: 6,300 km.
"NZ countries" might conflate: Realm of New Zealand (NZ + Cook Islands + Niue + Tokelau + Ross Dependency) — but Cook Islands/Niue are self-governing in free association, not countries between Perth and NZ.
Indonesia (Bali): 2,600 km — 3.5 hr flight.
Singapore: 3,900 km — 5 hr.
Kuala Lumpur: 4,100 km — 5.5 hr.
East Coast Australia (Sydney): 3,300 km — 4 hr.
New Zealand is distant — but the closest Polynesian-majority nation to Perth.