Australians and Afghan visa holders have been urged not to travel to Kabul airport where rescue flights have been the only passage out of the war-torn nation.
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Another 1200 people were evacuated from Afghanistan on six Australian and one New Zealand flight overnight.
Almost 4000 Australians, Afghan visa holders and people from allied nations have been airlifted from chaos in the Afghan capital since the operation began more than a week ago.
A fourth flight of evacuees arrived in Australia on Thursday morning, bringing the total number of people to arrive in the country from Kabul via Dubai to 639.
Prime Minister Scott Morrison on Thursday said the number had far exceeded the government's expectations going into the mission.
"It is a highly dangerous situation, we have been very honest about the nature of these challenges and the likelihood of being able to achieve everything that we would hope to achieve," he told reporters in Canberra.
"But we have to deal with the reality. The terrible, brutal and awful reality of the situation on the ground."
The Department of Foreign Affairs and Trade issued new advice as the situation deteriorated further in the Afghan capital.
"Do not travel to Kabul Hamid Karzai International Airport. If you're in the area of the airport, move to a safe location and await further advice," the department said.
"The situation in Afghanistan remains highly volatile and dangerous.
"Be aware of the potential for violence and security threats with large crowds. There's an ongoing and very high threat of terrorist attack."
The Taliban, which swept to power 10 days ago, claims western forces leaving Afghanistan will pave the way for people with documents to leave on commercial flights.
Mr Morrison said Australia would do everything it could to get more people out during the current operation but didn't dispute the number may not exceed its current level.
"I believe I have been preparing Australians about the difficulty of this operation and the extreme moral hazard of the environment in which we're operating," he said.
Evacuation operations are expected to end on Tuesday which is the United States' deadline to leave.
But the American military plans to focus on extracting its own troops in the final two days of the mission.
Amnesty International Australia director Sam Klintworth urged Mr Morrison to work with the US and other leaders to get vulnerable people to safety.
"The lives of thousands of people trapped in Afghanistan are in the hands of the Australian prime minister, and he should do all he can to ensure these people are brought to safety," he said.
Defence Minister Peter Dutton said the Taliban would be judged on its actions rather than words on the treatment of women.
"The last time they were in a position of authority or they exercised power it was in a very brutal way," he told 2GB radio.
Australian Associated Press
