Pretty last minute, but solid fares to Europe flying Turkish Airlines via KL and Istanbul.
These are only working from Sydney, for March 2025 departures (you can return in April).
It's possible to force a long stop on the return leg and take advantage of Turkish Airlines free stopover offer in Istanbul - if you want to do this, select a return flight with a 20+ hour stop in Istanbul on the return.
Sydney to Amsterdam $1340
Sydney to Barcelona $1284
Sydney to Budapest $1395
Sydney to Copenhagen $1380
Sydney to London (Gatwick) $1394
Sydney to Madrid $1267
Sydney to Milan $1286
Sydney to Rome $1296
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Any cheap flights to Constantinople?