Prime Minister Scott Morrison has rebuffed calls for a special one-off humanitarian intake outside the 3000 places allocated within Australia's regular annual program.

Mr Morrison said he didn't take any window for people to escape for granted after the United States, Australia and other allies left Afghanistan following an evacuation mission.

"When it comes to the guarantees, I am cautious about how substantial they will be, and for how long they will be in place," he told reporters in Canberra on Tuesday.

"Afghanistan is a place where the situation is deteriorating."

In 2015, the Abbott government announced a special one-off intake of 12,000 people from Syria.

The prime minister said 3000 people were taken in the first year of that program.

"We are very keen to meet at least the 3000 that we would like to see taken into Australia, and our humanitarian program this year and more," Mr Morrison said.

"We would like to see more."

Foreign Minister Marise Payne said Afghans granted protection visas who were not evacuated in recent weeks would receive advice from officials about safely leaving the country.

"It is an expectation, in terms of the ability for safe travel and safe transit, that we are very focused on," she said.

"We know that for those who remain in Afghanistan, it's a question of very significant concern."

The United States on Tuesday withdrew its remaining troops from Afghanistan, which is now controlled by the Taliban after 20 years of western forces' involvement.

A humanitarian disaster is unfolding in the war-torn nation with many trying to flee the regime left behind, despite 122,000 people being evacuated including more than 4000 in Australia's mission.

Mr Morrison said Australia evacuated four times the amount of people initially expected.

But he is still yet to speak to US President Joe Biden after the evacuation operation.

The prime minister denied he was "on the nose" with the American leader who has spoken to counterparts from the UK, Germany, Spain, France, Qatar, Italy and the United Arab Emirates.

"I just don't agree with that. I've been dealing with the United States on many issues, and we continue to do that," he told 4BC radio.

Mr Morrison said he anticipated a conversation with Mr Biden was not too far away.

The Australian Red Cross is facing a surge in calls for help from people desperate to reach their loved ones caught up in the chaos in Afghanistan.

In a bid to free up accommodation for Afghans in other states, Tasmania will on Sunday accept a flight of around 150 returning Australians travelling from the UK.

It follows a similar process to Tasmania's seasonal worker program.

Australian Associated Press