With the price of flights to South America being well over $2000 lately, and more like $2500, these are pretty cheap!
Sydney to Santiago for $1623 (nonstop)
Sydney to Buenos Aires $1618 (two stops)
Melbourne to Buenos Aires $1692 (2-3 stops)
Melbourne to Santiago $1628 (1-2 stops)
Dates are May and June for BA; and late April all the way through November 2023 for Santiago. Flights are on full service Qantas and LATAM.
I have shown the most bargain price available through Momondo, but of course you can book direct through the airline for an extra $60 bucks or so.
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https://au.trustpilot.com/review/www.momondo.com