Fully refundable ticket (Honolulu-Sydney)?

[Salem]

Hi all, I need a return fare to satisfy ESTA requirements but I don't actually know when I will be able to return. Does anyone know of a fully refundable one way fare I could buy (Honolulu to Sydney)? I am considering booking some award flights but I'll lose points when I inevitably have to change or cancel them. Thanks!

 

[serfty]

Do you not know when you are planning to depart the USA?

 

[Salem]

Yeh not sure so I ended up booking Qantas award flights. It'll cost me 5000 points to change or 6000 to cancel...