Earlier travel bans – and the prospect of quarantine for those who were allowed in – had already reduced travel to Australia to one-third of normal levels.
But stopping all but Australian citizens and residents entering the country will soon cut international arrivals to a trickle – mainly Aussies abroad heeding government advice to head home as soon as possible.
Qantas has agreed to keep services going from key locations to enable those repatriations, the PM said.
“About 80% of the cases we have in Australia are either the results of someone who has contracted the virus overseas or someone who has had direct contact with someone who has returned from overseas,” Mr Morrison added.
“So, the overwhelming proportion of cases in Australia have been imported.”