According to flight stats this flight runs excessively late about 34% of time:
FlightStats - (QF) Qantas Airways 1 Historical On-time Performance Rating
Maybe someone with more access to flight stats could give us alternatives on the route with better performance?
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Try again in a fortnight or so; flightstats reports on a moving two monthly band, updated periodically.I think it is a bit harsh quoting that 34% figure as that was for the period 15/10 to 15/12 when all the trouble was in Bangkok.
Mind you QF 31 vis Singapore doesn't look that good either at 24%.....