Originally Posted by
NetJets Germany
There are no arrival lounges at SIN.
You will not be able to access even a (not very exciting) PriorityPass without an onward boarding pass.
Just get your coffee from a Starbucks or similar coffee shop, if you want to shower, take a cab to your hotel, check in early and ask if you can use their gym or spa’s shower facilities if you’re room isn’t ready yet.
There is the Changi Lounge in the Jewel that accepts same-day arrivals.