Flex fares often allow change with no fee (fare difference may apply). Restricted fares (Saver/Saver Lite) usually incur a change fee + any fare difference. International short-haul and long-haul fares have higher change fees than domestic flights. Changes are usually allowed up to 30 minutes before departure (subject to fare rules). To request a change online use Manage Booking o... https://sites.google.com/view/jetstarairwaysmanagebooking/home