Senator Hanson's flights from London to Sicily via Rome, and back again, were all funded by Mrs Rinehart, the senator's parliamentary register of interests revealed after being updated on Tuesday.
However, Senator Hanson reported paying for accommodation, meals and daily expenses herself during the July 11 to 16 trip, as first reported by Fairfax outlets.
Senator Hanson drew criticism after she and Mrs Rinehart were sighted at a luxury Italian resort and attending a Dolce & Gabbana fashion event in Sicily.
Questioned when she returned to Australia, Senator Hanson did not go into detail on how the bill was split, but insisted taxpayers had not paid for the luxury weekend.
"It didn't cost the taxpayer one cent for my trip overseas. Not one cent," she told a Seven West Media event.
Senator Hanson, who was also gifted a private plane by Mrs Rinehart in April, defended her billionaire friend, who inherited Hancock Prospecting from her late father, saying she had "done it tough".
"She had to borrow everything and was flat out in the very start to pay the bills. She's built up that company," she said.
On Monday, Senator Hanson lost an appeal over a Federal Court finding she had made a racist remark towards deputy Greens leader Mehreen Faruqi.
In response to a post on social media soon after the death of Queen Elizabeth II in 2022, Senator Hanson told Senator Faruqi to "piss off back to Pakistan".
In his initial decision handed down in 2024, Justice Angus Stewart ruled the post was "seriously offensive" and a "strong form of racism".
Senator Hanson said she was disappointed by Monday's outcome and was considering lodging a final appeal in the High Court.
"Public discussion in Australia has become almost totally silenced by laws and rules which prevent ordinary people expressing their personal views in case some small part of our society takes some sort of offence or feels hurt or 'distressed'," she said in a statement.
"This has never been, nor ever should be, the Australian way."
Senator Hanson has 28 days to lodge an appeal with the country's highest court
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