Originally Posted by
Chris Miller
If you arrive at 1 AM, would you still need to leave the clean area to get your luggage if your next flight (at 8 AM) is on a different airline?
If you are coming in on UA, you can stay airside until the morning. There is a transit hotel and transit lounge that you can pay to stay in for the time between flights (google it). Otherwise you can spend time in the airport - there is a lot to do and see. You don't clear immigration at night but go down in the morning, clear immigration, grab your bag (they hold all the bags that aren't claimed outside a little office along the wall) and then go to the other airline counter and recheck it. I've done it many times. This won't work if you arrive at SIN on a LCC though.