Australia travel restrictions
From 6 July 2022, travellers will no longer need to provide evidence of vaccination. Unvaccinated travellers will also no longer need a travel exemption for entering Australia. There will also be no declarations required.
However, most states and territories require you to take a COVID-19 test within 24 hours of arriving in Australia. Be sure to check the requirements for the state or territory you arrive in and travel to from the government website.
Since the COVID-19 situation is still evolving, you should check the Australian Department of Home Affairs for the most updated information on Singapore to Australia travel restrictions before travelling.