A Qantas spokesperson told the Herald the diversion was out of an abundance of caution to check a mechanical issue.
“The aircraft landed safely and normally and was inspected by engineers. Passengers departed again for Melbourne after around 3 hours.”
Another Qantas flight from Brisbane to Queenstown this afternoon was also diverted.
Flight QF185 left around 11am NZST and, rather than landing at its intended destination, flew south around the resort town and diverted north to land at Christchurch Airport.
A Qantas spokesperson said “before landing, the pilots of our Brisbane flight received a system error message and elected to divert the flight to Christchurch where there were clearer weather conditions and the aircraft would be in a better position to be inspected by engineers”.
The flight from the Queensland city traditionally takes about four hours and leaves every morning.