Flight Christchurch International Airport departs from Christchurch Christchurch International Airport at 10:50 and arrives at Singapore Changi Airport at 17:40.
The flighttime is about 10h 50m. The distance travelled ("as the bird flies"): 8092 Km. So the average speed is roughly 747 Km.
There is an 4 hour time difference between Christchurch and Singapore