Flight QF134 from Christchurch to Brisbane was diverted to Auckland on Friday morning due to a suspected malfunction, Stuff reported.
Passengers were left waiting for over two hours before the aircraft left for Brisbane at 11.20am. A passenger described the incident as very frustrating.
"I changed flights to the early morning flight for work commitments, but despite paying to get an earlier flight I'm still stuck in New Zealand," the passenger told Stuff.
The incident came the day before a Qantas flight from Melbourne to Wellington was diverted to the Ōhakea Air Force base on Saturday afternoon, also due to a mechanical issue.
Passengers on that flight said the captain informed them the reason for the diversion was one of the plane's flaps was stuck and the runway at Wellington was too short to land safely.
That plane landed at Ōhakea just after 3pm - but passengers had to wait on the plane with no food until about 7pm when Customs officials from Wellington and Napier arrived to process them.
Passengers were then loaded on to buses to Wellington at 8.40pm.
Qantas apologised to its customers on Saturday.
