Want to check out Western Sydney International Airport? You can visit for free

Curious about the layout of the new Western Sydney International Airport, what it will look like and where you will park?

Sydney's newest gateway is offering three hours free parking to come and experience the airport ahead of your first trip.

Or even if you haven't booked a flight, you can turn up and have a gander.

The free parking is available to book online from October 12, with three-hour visits starting from October 26 and going through until April.

Or if you've already booked your flight, there are also discounted "drive up" parking prices available from October 25 to April. These include parking from $15 a day in the long-stay area, saver parking from $29 a day and premium parking from $49 a day.

WSI's precinct has over 6000 carparking spaces, across premium (P1 and P2 covered), saver (P2 uncovered) and long-stay (P4). Travellers can also access a free 15-minute express pick-up and drop-off zone.

Premium and saver parking in P1 and P2 are within a three-minute walk from the terminal, while long-stay P4 is a short, free shuttle bus ride from the terminal.

Online bookings will ask for the customers' licence plate and will use licence plate recognition for entry and exit.

Book parking online including your three-hour free spot at wsiairport.com.au/parking-launch

For those who want to catch public transport to the airport, a free shuttle bus service called WSI Link will run between St Marys train station and the airport every 30 minutes between 4.30am and midnight, Sunday to Thursday, and between 4.30am and 1am, Friday and Saturday.

This temporary service will run once passenger flights begin and will operate until Sydney Metro services start.

Another shuttle service called Super Shuttle WSI will connect the airport with Parramatta, Sydney CBD and the legacy Sydney Airport. Tickets and pricing will be available closer to the opening in October.

WSI CEO Simon Hickey said WSI is going to be a "game changer" for Greater Sydney.

"We are thrilled to offer people the opportunity to come and experience their newest airport, free of charge, with three hours free parking from launch," he said.

"The majority of passengers typically travel to and from the airport by car, so we've focussed on delivering a great product that provides choice and flexibility for our customers. This means they're in the driver's seat and can select the option that best suits their needs."

He said two-thirds of Sydney's population live within a 45-minute drive of WSI, and the new toll-free M12 would provide "efficient connectivity" to the airport.

The Federal Government is undergoing $3 billion in road upgrades to help smooth the journey to the airport for locals and Sydney-siders coming from further afield.

WSI's first passenger flight will be operated by Jetstar to the Gold Coast on October 25.

A handful of other airlines have signed-on with the airport, which will run 24 hours a day.

Singapore Airlines will be the first international airline to take off from the new airport in November.

Air New Zealand will begin flights in October, VietJet will begin flying in January, and Fiji Airways will be flying in March.

Qantas will take-off from WSI in March.