Originally Posted by
number_6
I have seen QF offer cash upgrades that were less than the fare difference ex-LHR, NRT, HKG and SIN but not always and maybe not often. It was always double or triple the price compared to other airlines offering such upgrades (e.g. BA) on similar routes. But times change and who knows what QF is doing this month
I've gotten cash upgrades out of SIN before on the way to SYD that were a lot less than the fare difference, but still not "cheap" by most definitions (substantially lower than actually purchasing a J ticket, though).
That said, I don't believe QF offer them ex-SYD, and even then it seems to depend on station to station (when I tried at PVG for example, it was a horrendous amount - likely the actual fare difference at the time).
Worth asking, I find.