The cheapest flight we have found to go to Borneo is leaving early morning. This is why we decided to go to the airport tonight and sleep there. At first, we planned to catch the train from Ampang and take a second one at some point but Amir offered us to drive us at another station so that way we did not have to hop on two trains. Thanks for this :-) The train cost 6.30Ringgit to get to KL Sentral.