"I don't want to go to Switzerland, though it's a nice country", Dr Goodall said.
Euthanasia is still illegal in Australia, including in Goodall's home state of western Australia.
Who is Australia's oldest scientist David Goodall?
Dr David Goodall with Exit International's Carol O'Neil.
On his 104th birthday in early April, Goodall said his birthday wish was to die and claimed he greatly regretted having lived to such an age.
He resents the fact that he couldn't die at home with his family, but that might change one day.
Victoria became the first Australian state past year to legalize assisted suicide, but its provisions only apply to terminally ill patients with a life expectancy of six months or less.
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A committee tasked with investigating end of life choices in Western Australia will report back next month, and legislation could follow.
"My belief is that any rational adult should have the ability to access the drugs which would give them a peaceful, reliable death", Goodall further said.
Mr Goodall was born in 1914 in London and moved to Australia in 1948, where he remained for the rest of his life. His decade-long academic career spanned three continents before he retired in 1979, although he continued working, editing a 30-volume series of "Ecosystems of the World" and traveling by gyrocopter to the visit an eco-sustained cattle station as recently as a year ago. Although he does not have a terminal illness, he has argued that his quality of life has deteriorated sufficiently to merit voluntary euthanasia.
"No, I'm not happy". Philip Nitschke, who heads the voluntary euthanasia advocacy organization Exit International, said in a tweet that the funds will also help offset other costs related to the procedure.
A GoFundMe campaign raised more than 20,000 Australian dollars (€12,500, $15,000) to support his travel to Switzerland. Goodall, who is now 104 and caused a stir when his university tried to vacate his office aged 102, will fly to Switzerland in early May to end his life, reigniting a national euthanasia debate.
He is expected to travel to France to visit other relatives before heading to Switzerland, where he plans on ending his life on May 10, according to The Local.
Nitschke said Goodall had recently attempted to take his own life but ended up waking up in hospital instead, where the doctors' judged he was a risk to himself. "He will be very relieved when the plane actually takes off". He has held academic positions in the United Kingdom, the United States and Australia. "I don't think anyone else should interfere".