The announcement comes as South Australia has decided to open its borders to people coming from Queensland.
Premier Steven Marshall says the change will take effect from midnight on Friday and means anyone coming from that state will no longer be required to spend 14 days in quarantine.
The decision follows an earlier move by SA to lift coronavirus restrictions on people coming from Western Australia, Tasmania and the Northern Territory.
Jetstar is offering 10,000 one-way fares for $19 on 22 routes, including Melbourne to Sydney, Sydney to Gold Coast, Melbourne to Ballina, Brisbane to Whitsunday Coast and Adelaide to Cairns.
Other routes have also been discounted but not to the same extent.
Qantas is offering triple points for frequent flyers on all routes as part of a plan to reboot domestic air travel.
Customers of both airlines will also be given more flexibility to change flight dates without being hit with fees.
Qantas Group chief executive Alan Joyce said almost 400,000 seats have been sold on Qantas and Jetstar’s domestic networks in the past two weeks, after some state borders opened.
He said he hoped the sale and points offers would boost that further and help tourism operators get back on their feet.
Qantas and Jetstar will continue to reintroduce flights across the domestic network in line with demand and the easing of border restrictions.
Jump to next article