Cheaper method to go from Kuala Lumpur to Singapore.

First method is the fastest way which is by flight. Cheapest ticket I have ever bought is RM65. Maybe there is even cheaper ticket.

 So for two ways will be around RM200 because the ticket from Singapore to Kuala Lumpur will be more expensive because it is in Singapore Dollar. Cheapest flight that I had ever bought is SGD45, around RM110. The travel time will be less than 1 hour. But the time u need to travel from your living place to airport will be roughly 1 hour if you are living in Kuala Lumpur or Selangor.

Second method is by bus. By bus, it will be around RM140 for 2 ways. For luxury bus will be even more expensive. The travel time is about 5 hours

Third method will be by KTM, keretapi tanah melayu, train. A very slow train. 2 ways is around RM68 if you take a normal seat. I bought one way seat with bed with RM40. The time needed is about 7-8 hours. I will suggest you buy the seat with bed and take the train at 10.30pm from KL Sentral so you can sleep all the way to Singapore and straight go to the place you wanted to.