Q:

Lounge access on arrival at Singapore airport Terminal 2

I will be arriving at Singapore airport terminal 2 at 3:00 am in the morning and my hotel doesn't allow me early check-in. I have a priority pass. Will I be able to access the Lounge on arrival? 

A:

I was at the Singapore airport today and was allowed the entry at the Ambassador Transit Lounge in terminal 2 with no issues whatsoever. The guy at the reception did not even bother checking the boarding pass and He told me that they always take people in holding the PP.
I don't know about the other lounges but you can always go to 'The Haven' arrivals lounge if you are denied entry.

