Budget airline Jetstar has cut prices on flights between Adelaide and Sydney as the border opens back up for the first time in months.

South Aussies will be able to get over to the NSW capital for as little as $59.

The airline is launching a 36-hour flash sale to celebrate the border reopening, with five thousand of the cheap seats on offer just in time for school holidays.

The sale kicks off at midnight AEST tonight and will run through until Thursday at 11:59pm (or when flights sell out).

Jetstar will also be increasing the number of flights on the route from five per week to twice a day at the start of October.

Parent company Qantas has also announced that it will be reintroducing daily direct flights from Thursday with fares starting at $213.

Under the relaxed border rules, those entering the state from New South Wales will no longer be subject to a mandatory 14-day self-isolation period.

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The move on the border means that Victoria will become the only Australian state subject to restrictions for those entering SA.