So that would be GBP1549+taxes for LONE4s then?

081 is Qantas.

If it is an LONE4 then the change conditions are USD125 per head plus whatever service fee QF charges (perhaps 25 quid) for each reissue of the ticket, regardless of how much you change it during that reissue. You'd need availability on the flights you want to take of course.

But I suspect it won't be that easy - it could be that you've been sold something cheaper than an LONE4 by the consolidator and somebody's making a tidy profit somewhere - trying to get all your flights rebooked in L at this stage might be tricky.

That being so, the easiest course of action would be to book a hotel near HNL for you last night. Even if you have an uncancellable booking on the other island that is likely to be cheaper and less hassle tan two sets of change fees.