Christchurch man Paul Weeks, who was on missing flight MH370, is officially dead, an Australian court has ruled.

The Perth-based father of two was one of the 239 passengers on board the Malaysian Airlines flight which disappeared in March 2014 en route from Kuala Lumpur to Beijing.

His wife, Danica, has not heard from him since and applied to Western Australia's Supreme Court for leave to swear to the death of her husband so that she can apply for letters of administration -- part of the process where a person has died without leaving a valid will, The West Australian reported.

Registrar Christopher Boyle said there was no reason to doubt Mrs Weeks' evidence that she drove her husband to the airport and that he boarded the flight to Kuala Lumpur. He had onwards tickets to Ulaanbaatar.

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Mr Weeks, a former engineer from Christchurch, was travelling to Mongolia for his new job with Transwest Mongolia. He was one of two Kiwis on the flight -- the other was Ximin Wang, 50, from Auckland.