Originally Posted by sharp5flat9

That's correct. The fee is collected when you rebook, in addition to the change fee and any fare increase. Unless you just let the return half expire.

I find QR pretty flexible. If I need an 'open return', I just book a cheap round trip ticket and cancel the return flight once I've arrived. They are happy to leave it 'open' and I pay the change fee when I finalise the return date.