Originally Posted by
graraps
As you would expect from an airline of their size, CZ do fly to Australia.
Also you may want to try AF; they have SQ-operated codeshares to Oceania. Not sure whether you're able to use DL miles for them.
Minor correction, but AF actually code-shares on QF to a variety Australian cities from HKG and SIN. Unlikely that you will earn DL miles for these AF code-share flights with QF.