See post 13 above
If that is both ways and USD:- sort of OK tending to high. If NZD:- Yes.
But fares can peak at school holiday/vacation time.
Some of the cheapest fares may not includ checked baggage or food/water
All fares are simple one way. None the silly rules that seem common in the USA. A return is effectively just 2 one ways.
As regular trans Tasman flyer I almost never use the same airline both ways
Look at the co.nz, com.au sites or select NZ if a .com site
There is no particular advantage in booking both flights on one airline.
But NZ fares can be less than the same flight bought in Australia (as the 2nd leg of 2 segment fare)
Airlines that fly Australia (CNS BNE OOL SYD MEL ADL PER) to/from New Zealand (AKL WLG CHC ZQN) (not from all airport to all airports)
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Air New Zealand (codeshares with VA) [Star Alliance]
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Virgin Australia (codeshares with Air NZ) (Delta partner)
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Jetstar (a low cost low quality carrier with low-medium-high priced fares owned by QF)
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Qantas (codeshares with EK) [OneWorld Alliance]
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Emirates (codeshares with QF)
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LAN (SYD AKL) [OneWorld Alliance]
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China Airlines (BNE/SYD/MEL – AKL/CHC) [Skyteam Alliance]