How mobile-friendly is Jetstar?
There is an iOS app from Jetstar which will work on your iPhone, iPod, or iPad.
For Jetstar Jetstar's Plus, Max or Business Max members, you'll be able to manage your account from the app, though using their website will no doubt provide more functionality
Jetstar has an Android app that works with most Android tablets, phones, and some Android Wear devices. You can get the same stuff done on the Android app as you can on the iOS app for Jetstar.
Also take a look at Jetstar's website by clicking here — you should be able to do what you need there.