Passengers arrive in Sydney from COVID-19 hotspot as other states slam borders to SA

Hundreds of passengers from South Australia are set to arrive in Sydney today despite growing fears of a second wave of COVID-19 in Adelaide.

Nine flights are due to touch down in Sydney today from the growing hotspot, with passengers not required to undergo a quarantine period.

READ MORE: Medi-hotel at centre of SA outbreak evacuated

SA Health teams have put 160 close contacts of the cluster into isolation, as all states and territories - except for New South Wales and Victoria - slammed borders shut.

There are now 18 people connected to a cluster in the Adelaide's north after one new case was confirmed overnight.

All international flights into Adelaide have been suspended while the Northern Territory, Western Australia, Tasmania and Queensland have closed their borders to the state.

NSW and Victoria remain open despite deeming SA a "hotspot".

READ MORE: NSW records 10th consecutive day with no local coronavirus cases

A nearly full Virgin flight arrived in Sydney this morning, with passengers disembarking wearing masks and undergoing temperature checks as they exited the flight.

NSW resident Ruben Gurie said he booked a spare of the moment flight home from Adelaide in anticipation for a possible border closure.

"I was seriously concerned they would shut the borders so I had to get an earlier flight into NSW," Mr Gurie told 9News.

"I live in NSW so I had to get back ... I am seriously glad to be home."

"Adelaide seems to be pretty good at the moment ... there's a lot of COVID restrictions going on there. During the weekend everyone was social distancing and it was quite quiet, most of the restaurants weren't full."

Mr Gurie said he and other passengers were subjected to strict health screenings before being allowed to exit the flight.

"It was a very well done, it was very professional and they were very thorough in doing it so I think it was awesome," he said.

Holiday-makers are now likely to flood into NSW and Victoria to avoid a two week quarantine period in other states.

Daniel Kirkbride and his partner Sky Solomons-Foat told 9News they were relived to have made a last-minute decision to spend their week-long break in Sydney instead of the Gold Coast.

"We just came for a holiday and luckily we booked Sydney instead of Gold Coast ... so thanks for letting us in," Mr Kirkbride told 9News.

"We booked prior to knowing anything so it was a bit of a shock to find out our holiday might have been cancelled but luckily here we are," Ms Solomons-Foat said.

Flights are expected to touch down in Brisbane and the Gold Coast today from SA, however all passengers will be required to isolate in hotel quarantine for 14 days.

SA remains on high alert as thousands come forward to be tested - a process which authorities hope will reveal the extent of the cluster.

Contact tracers have identified at least 18 suburban locations — including major shopping centres, medical centres, supermarkets and fuel outlets — where people may have been exposed to the cluster between November 7-14.

"We will throw absolutely everything at this, to get on top of the cluster," Premier Steven Marshall said at a press conference yesterday.