Jetstar Airways Manage Booking | Change, Cancel & Name Correction Guide Australia

Full refund may be available if you cancel within 24 hours of booking and the booking was made directly with Jetstar (website, app or call centre) and the flight is booked 7+ days before departure.
Refunds are usually processed within 7–10 business days (timing may vary by payment method).
To cancel: use Manage Booking online or call +61 (1800) 005 886.
https://sites.google.com/view/jetstarairwaysmanagebooking/home