Flight Sydney Airport departs from Sydney Sydney Airport at 18:55 and arrives at Christchurch Christchurch International Airport at 23:55.
The flighttime is about 3h 00m. The distance travelled ("as the bird flies"): 2577 Km. So the average speed is roughly 859 Km.
There is an 2 hour time difference between Sydney and Christchurch
The best day to arrive at Sydney is Wednesday and it would be best to avoid Monday, as prices are on average 178.65% higher than on Wednesday. (Average prices, based on 165285 datapoints.)
We have a lot more statistics for flights QF 139 and between Sydney and Christchurch.