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Singapore Airlines used to provide a free layover hotel (for 6 hours) on some routes but that ended in 2019.
They still do offer a free city tour of Singapore that is fun.
No need to do immigration or anything.
singaporeair.com
Free Singapore Tour | Singapore Airlines
Capture the spirit of Singapore during your layover with our Free Singapore Tour. Click here to explore our tours and book one that fits your flight schedule best.