Doubt if any quarantine required from around mid September when it appears most international routes ex Australia will reopen.
There are travel wholesalers right now selling cheap fares to USA departing late December or early January from around $900 return. Very low for school holidays.
Unlikely most international routes will reopen in September. At best, I'd expect NZ, Fiji and maybe Japan and Singapore around September. Government will see how this goes before attempting broadening allowed countries. I wouldn't expect Europe before January and USA, Easter 2021 at earliest.
Airlines and agents may be advertising $900 US fares for Christmas but they are speculative at best and you'd be foolish to buy them unless they came with a full refund guarantee.
plenty of people think September will have to be go for all flights. We like NZ need all the tourists will can get. It would be insane to be able to fly to somewhere only via NZ but not direct.
It is highly unlikely you will be able to fly outside the bubble via NZ either. Borders will reopen on a bilateral basis. For example, if Singapore is open, you will not require quarantine on return if you only visited Singapore but if you also visited another country, say India, whilst away, you would still be required to quarantine and probably at your own cost by then too.
We do need tourists but if other countries are still struggling to suppress Covid such as US is now then the government will not risk a reopening of the border. Even now, you can see that over half the cases are returning travellers. That tells you how serious the situation is overseas and how fortunate we are to have such low transmission rates.
717, 721/2, 732/3/4/5/7/8/9, 742/3/4, 752/3, 762/3, 772/E/W, 788/9, 300,310, 319,320/1, 332/3, 359, 388, DC9, DC10, F28, F100, 142,143, E75/90, CR2, D82/3/4, SF3, ATR