Power, 63, and his son Nicholas Power, 36, admitted failing to self-quarantine upon returning from Queensland on a private helicopter in October last year, an offence that carried a maximum penalty of 12 months' imprisonment.
It came just 18 months after Neville Power was appointed to head up Prime Minister Scott Morrison's since-disbanded National COVID-19 Coordination Commission.
Magistrate Elizabeth Woods on Wednesday imposed an eight-month prison sentence on the pair but ordered that it be wholly suspended.
"This was not a momentary aberration," she said.
"It was a deliberate choice by each of the two accused and in my view, it was a disrespectful and foolish choice.
"It showed a significant lack of judgment with potential for very serious consequences to the community."
The court heard Power and his son had flown separately to Queensland in September last year, spending a week mustering cattle at the family's Bushy Park station near Mt Isa.
They flew back to WA together on a private helicopter, staying overnight in Exmouth in WA's north - where they were captured on CCTV footage moving freely around a resort while not wearing face masks - before arriving at Jandakot Airport on October 9.
Travellers from Queensland were required at the time to isolate for 14 days upon arrival in WA under the state's controlled border regime. They also had to complete G2G pass declarations advising of their recent movements.
But the pair did not make G2G applications and failed to isolate, with Neville Power joining other business elites and politicians at the Telethon Ball on October 16.
They each pleaded guilty to two charges of failing to comply with a direction under WA's Emergency Management Act.
Ms Woods said a fine, "no matter how substantial", would not reflect the seriousness of the offending, particularly for the senior Power.
"He was on the national COVID commission ... he was well aware of the COVID issues and he was well aware of the solutions and he was well aware of the laws," she said.
A police prosecutor last month said the pair's actions had put West Australians at unacceptable risk and a term of imprisonment was appropriate.
Their lawyer, Sam Vandongen SC, had urged the magistrate to instead impose substantial fines on the pair.
He also flagged they would apply for spent convictions which would allow Neville Power, the former chief executive of Fortescue Metals Group, to continue in his board roles.
Power last month stepped down from his role as Perth Airport chairman and was granted a leave of absence from board roles with Strike Energy and disability services provider APM.
He also recently resigned as chair of the Royal Flying Doctor Service Federation.
Mr Vandongen cited a psychological report which said Power had suffered stress-induced "cognitive distortions" which had clouded his judgment.
The court heard Power had wanted to avoid quarantine because he had found it difficult on previous occasions during the pandemic, while his son claimed he simply did not consider it due to being busy.
More than a dozen personal references were submitted to the court on their behalf, including one from billionaire FMG chairman Andrew Forrest.
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