I arrive May 18 at 01:00 and depart around 09:00 same morning. Unfortunately the SIN transit hotel is fully booked. They said to check with them upon arrival, if there were any cancellations.

How likely do you think I could get in to the transit hotel? (are there usually cancellations?) Or should I just go ahead a book Fragrance Hotel to guarantee that room?

I really don't want any hassel after flying for 20+ hours.