How long is an aeroplane flight from Sydney to Antarctica?

Answer 1

There is no commercial air service that lands anywhere on the Antarctic continent.

However, there appears to be a tour operator offering a 12-hour, round-trip overflight to the edge of the continent and back, from Sydney. They offer options between about AUS$1,100 and AUS$8,000, depending on where you sit and the amenities and services you require.