<Revised on 21 November 2020>

The Government of the Hong Kong Special Administrative Region (HKSAR) announced that in view of the recent epidemic situation in Hong Kong, the Governments of HKSAR and Singapore have decided to defer the inaugural flights under the Hong Kong-Singapore Air Travel Bubble (ATB) for two weeks.

https://www.info.gov.hk/gia/general/202011/21/P2020112100656.htm

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From 22 November 2020, quarantine-free travel between Hong Kong and Singapore is possible!
Please see below website for details.

https://www.tourism.gov.hk/travel-bubble/en/index.html
with video
https://www.hongkongairport.com/en/COVID19.page