The NSW government's windfall from fees charged to passengers who use trains to get to and from Sydney Airport topped more than $110 million last year.

The 10 per cent rise in revenue from the station access fee on the Airport Line takes the amount collected by the government over the past five years to more than $420 million.

A one-way train trip between central Sydney and Australia's busiest airport costs an adult passenger $19.40, making it the most expensive journey on the network. Of the ticket price, $14.90 comprises the access fee passengers are charged when they pass though station gates at the airport's international and domestic terminals.

The access fee for stations at Sydney Airport is $14.90 for adult passengers. Credit:Rhett Wyman

NSW Labor's acting leader, Yasmin Catley, said the access fee was "just another example of the government slugging commuters to shore up its increasingly precarious budget surplus".