The travel ban began on Tuesday at 8 p.m. (6 p.m. AEST) and will be in place for at least 72 hours.
Hipkins said the government understood the disruption it would cause to passengers looking to travel during the ban. However, they considered it the correct call given the situation.
The latest COVID-19 cases are all connected to Whittlesea City, with 11 new cases reported in the last 24 hours. Victorian health officials have said they believe there could be more cases to come.
Meanwhile, Australian Prime Minister Scott Morrison will travel to New Zealand to meet Prime Minister Jacinda Arden in Queenstown on May 30. They will be accompanied by their partners.
It will mark the first overseas trip of the year for Morrison and the first trip to New Zealand in over a year. The two leaders last met in Sydney in late February, around the time the first COVID-19 case in New Zealand was detected.
Ardern said the visit would be a good opportunity to celebrate the resumption of two-way quarantine free travel with their “trans-Tasman cousins.”
“Discussions will centre on how Australia and New Zealand will meet the shared challenges we face. The key focus of the meeting will, of course, be our COVID-19 recovery as well as how we continue working together on key regional and security issues.”