Please see Travel Advisories from the Singapore’s Ministry of Health (MOH) on COVID-19 :
FROM SUNDAY 30 MAY 2021, All travellers (including Singapore Citizens and Permanent Residents) would be required to have 72-hr Pre-dep PCR test (PDT) to enter Singapore.
*“Travellers who arrive in Singapore without a valid negative test may be denied entry. PRs and long-term pass holders who fail to comply with the new requirement may have their permit or pass cancelled.
Singapore Citizen and Permanent Resident travellers who face difficulties with taking a pre-departure COVID-19 PCR test prior to departure for Singapore can contact ICA via the Safe Travel Enquiry Form or contact the Safe Travel Enquiries Helpline at +65 6812 5555 for assistance.
For more info: https://safetravel.ica.gov.sg/sc-pr/requirements-and-process
From 7 May 2021 2359 hours, The Stay Home Notice (SHN) will be lengthened to 21 days for travellers arriving from all countries and regions except Australia, Brunei, Mainland China, New Zealand, Taiwan , Hong Kong and Macau.
For more info: https://www.moh.gov.sg/news-highlights/details/updates-on-local-situation-border-measures-and-shift-to-heightened-alert-to-minimise-transmission_4May2021
From 26 Oct 2020, To apply for Reciprocal Green Lane (RGL) for short-term business and official travel between Singapore and Indonesia please refer : – https://safetravel.ica.gov.sg/indonesia/rgl/requirements-and-process