CANBERRA: Australia has fully reopened its international borders to travellers vaccinated against the coronavirus after nearly two years of pandemic-related closings as tourists returned and hundreds of people were reunited with family and friends.

More than 50 international flights will reach the country through the day, including 27 touching down in Sydney, its largest city, as the tourism and hospitality sectors look to rebuild after getting hammered by Covid-19 restrictions.

"It is a very exciting day, one that I have been looking forward to for a long time, from the day that I first shut that border right at the start of the pandemic," Prime Minister Scott Morrison told reporters in the island state of Tasmania, which relies heavily on tourism.