The city of Melbourne is served by a number of public transport systems, however there is no train currently linking Melbourne Airport to the CBD.
However, the airport does have a bus transfer service that runs directly from the CBD to the airport – this service is known as the SkyBus.
SkyBus Melbourne, Airport Bus Timetable / Schedule & Ticket
A recent survey also claims that this airport shuttle service serves more than 2 million passengers every year. The SkyBus shuttle operates every 10 minutes from 6am to 11.30pm and slightly less frequently after midnight.
You can catch the SkyBus from the Southern Cross Station bus terminal (enter from Spencer Street near the Bourke Street intersection). There is no need to book, simply turn up at the station and purchase your tickets from the ticket booth or by credit card using the e-kiosks located there. The SkyBus is equipped with free Wifi and you do not pay for baggage. So if you are looking for a hassle free way to get in and out of the airport, the SkyBus is a great option!