Always remember on an xONE that you can normally fly QF107/108 (Qantas B744 LAX-JFK) although this normally precludes flying on the A380 unless you have a long transit.

QF does not flythe A380 to BKK.
Only SYD/MEL-SIN-LHR and SYD/MEL-LAX at present.
Would expect it to go on the HKG route before BKK.

So would need to fly either in or out of SIN.