There are 11 airlines offering flights to Singapore. The most direct route isn’t necessarily the cheapest – being flexible is key to finding the lowest airfare rates. For example, try searching by month to see the best time of the week to fly. The cheapest date is currently 11 / May / 2019.
You can use the filters on your search to see more flights and find cheaper rates – Singapore has more than one airport. So if you don't need to fly into Singapore Changi International Airport, it's worth checking your other options. The 1093 km flight usually takes about 7 hrs.
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.