We've scanned every flight from Kota Kinabalu to Singapore to find the best deals. If you want a cheap flight, it's best to be as flexible as you can on dates. If that day's no good for you, try searching by month to see some alternative dates.
Make sure you use the search options above to search for flights to other airports in Singapore, not just Singapore Changi International Airport. The more options you look at, the better your chance of finding a cheap deal. Just so you know, the flight typically takes 8 hrs 40 mins.
There are about 28 flights to or via Singapore every week, so you have plenty of options.
If you're planning on going to Singapore during this time, you could take a look at other airport options. Or you could try to get a last-minute bargain.