Originally Posted by
tr3k
There are airside hotels in the main terminal at SIN and, to the best of my understanding, airside shuttle bus from T4 to T2 - which I intend to take.
there are transit hotels airside at SIN T1, T2, T3 and there is an airside transfer shuttle from T4 to T2, but you need to have a transfer service. If you have one ticket, the transfer would be included. If you have two separate tickets, there is a transfer desk that checks and you'll probably have to exit through immigration and take the landside bus...
But immigration is very quick, so shouldn't add a lot of time...