South Australian authorities have announced a range of COVID-19 restrictions will be eased from next week as work continues to contain a cluster of cases.

South Australia has revised a range of COVID-19 restrictions, including opening the border with Victoria, after reporting no new cases linked to the worrying Parafield cluster.

The requirements for Victorians to quarantine when they come to SA will be completely dropped from December 1, with authorities expecting a large number of people to take advantage of the change in the lead-up to Christmas.

From Tuesday, SA will also wind back some measures put in place when the Parafield outbreak was first detected.

Patron caps for pubs and restaurants will be scrapped provided venues are using the new QR check-in codes, although the one person to every four square metres rule will continue to apply.

The density requirement will be reduced to one person to every two square metres for any outdoor activities where stand-up consumption will also be allowed.

Limits on funerals will be raised to 150, with the same number of people already allowed at weddings and other private events.

Home gatherings will continue to be restricted to 10 people.

Premier Steven Marshall says the new rules will remain in place for two weeks as SA begins to return to the level of restrictions enjoyed before the Parafield cluster.

"These chart our course back to where we want to be by Christmas," Mr Marshall said.

Police Commissioner Grant Stevens said the stepped down restrictions were part of a wider move to "free things up as much as possible".

"SA Health still have grave concerns about the potential for this Parafield cluster to continue to move through the community," he said.

"We'll do our bit to make sure that doesn't happen.

"We didn't envisage that we'd be taking these mid-steps today but this is a prudent, balanced approach that ensures public safety.

"We have enforceable conditions we're putting on the community and once again we're asking the community to do as much as they can over the next two to three week period to help us eliminate this particular cluster."

Premier Steven Marshall's described SA's response to the Parafield cluster as "textbook", with record testing rates and extensive contact tracing.

He said that should give other states confidence to quickly lift any border restrictions that were put in place.

The premier said he had also written to Prime Minister Scott Morrison asking for a further delay in any international flight arrivals.

He said the pause in flights would now continue until December 7.

With no new cases reported on Friday, the Parafield cluster remains at 31 infections, with just one person, a woman in her 50s, in hospital. She is in a stable condition.

SA performed more than 12,300 tests on Thursday.