Jetstar is having a huge 'Half-Off' Sale. Lots of routes on sale, not just the ones listed by the government so thats great. Travel dates vary depending on the route.
Regarding Border Closures/Flight Cancellations. Full details on how Jetstar handles things:
What if I can’t travel due to border restrictions?
"If you booked on jetstar.com and your upcoming flight is affected by a border closure or lockdown impacting travel between the destinations listed in the booking, you will be eligible for a credit voucher for the full value of your booking. Depending on the circumstances, cash refunds or free changes to flight dates or times might also be available. "
Jetstar also offers FareCredit (for a fee)
"FareCredit lets you cancel your booking for any reason and get a FareCredit voucher for the value of your fare (plus any in-flight extras). You can cancel your trip for any reason (even if you’ve checked in online) until airport check-in opens for that flight"
Departing Melbourne (Avalon)
ADL to Cairns Flights one way for $94
….Travel Dates: 13/Jul/2021 - 22/Sep/2021
Departing Melbourne (Tullamarine)
BNE to Adelaide Flights one way for $66
….Travel Dates: 07/Jul/2021 - 12/Sep/2021
Departing Gold Coast
Notes about this sale from the Jetstar website:
Checked baggage not included. Available until sale ends or sold out. Selected travel dates apply, not available on all flights or days. Availability may be limited.
For this airfare and more, check out our deals site http://iknowthepilot.com.au/