So I need to be in BKK in December this year for a wedding and had a look at economy prices (ex SYD), SQ was asking for $1,600 rtn, Thai at $1,350 and QF at $1,500. Given you can get rtn fares around $700-$800 in low season, I'm bit loathed to part with my hard earned. I have a stash of KF miles...