If you ae travelling with anyone, taxi is the cheapest option. If you are on your own the train is around half the cost of a taxi - though remember you'll need transport from the station.

Bus easily trumps them both - though it takes a little longer, and it's not such an easy option from KLIA (the main terminal); from the LCT it's simple, bus outside the terminal and a fare of around MYR10 or less.

Tripadvisor can be a very good friend for these things.