Please see Travel Advisories from the Singapore’s Ministry of Health (MOH) on COVID-19 :
Additional Precautionary Measures to prevent further importation and spread of COVID-19 cases :
From 16 March 2020, 2359 hours, all travellers (including Singapore Residents, Long Term Pass holders, and short-term visitors) entering Singapore with recent travel history to ASEAN countries , Japan, Switzerland, or the United Kingdom within the last 14 days will be issued with a 14-day Stay-Home Notice (SHN).
From 20 March 2020, 2359 hours, all Singaporeans, Permanent Residents, Long Term Pass holders and short term visitors entering Singapore will be issued a 14-day Stay-Home Notice (SHN). They will have to provide proof of the place where they will serve the 14-day SHN, for example a hotel booking covering the entire period, or a place of residence they or their family members own.
From 27 March 2020, All travellers must now submit the electronic health declaration before they enter Singapore using the SG Arrival e-Service. You can do so up to three (3) days before your arrival in Singapore.
Click here for more info: http://www.brf.com.sg/wp-content/uploads/2020/03/SGAC_health-declaration-v8.pdf
From 4 April 2020, To protect Singaporeans and further ring fence the risk of community transmission from imported cases, all Singapore Citizens, Permanent Residents and Long Term Pass holders returning from ASEAN countries, France, India and Switzerland from 5 April 2020, 2359 hours will be required to serve a 14-day self-isolation at dedicated Stay-Home Notice (SHN) facilities. This arrangement will continue to apply to returnees from the UK and US.
From 8 April 2020, From 9 April 2020, 2359 hours, all Singapore Citizens, Permanent Residents and Long Term Pass holders entering Singapore will be required to serve a 14-day self-isolation at dedicated Stay-Home Notice (SHN) facilities.