Different routes between same airports

These two planes took off from Melbourne YMML heading for Perth YPPH less than 15 minutes apart.

Expected flight time for the Virgin plane is 1 hr 36 longer

QF485 took a normal Great Circle Route over the Great Australlian Bight. 1464 NM 3hr 38 min at 40,000

and VOZ679 is flying a much longer circuitous route 2009 NM 5hr 14 min at 40,000 ft

I have never seen a route from Melb to Perth via central Western Australia before.

Is there any explanation please?

S.

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