According to flightstats.com:
(April 1st - May 31st 2007)
EK418 SYD-AKL
Ontime: 82%
Ave Delay: 21 minutes
EK419 AKL-SYD
Ontime: 90%
Ave Delay: 26 minutes
EK412 SYD-CHC
Ontime: 68%
Ave Delay: 31 minutes
EK413 CHC-SYD
Ontime: 100%
Ave Delay: 4 minutes
Cheers,