The best day to arrive at Wellington is Saturday and it would be best to avoid Monday, as prices are on average 157.89% higher than on Saturday. (Average prices, based on 869110 datapoints.)
Monday€ 373
Mon
Tuesday€ 183
Tue
Wednesday€ 167
Wed
Thursday€ 246
Thu
Friday€ 166
Fri
Saturday€ 145
Sat
Sunday€ 233
Sun
Analyse direct flights between Wellington and Sydney.