Sydney Airport made $97.8 million in profit from car parking fees in just one year, a report released by the Australian Competition and Consumer Commission (ACCC) shows, as the body calls for greater regulation of airport competition.

The latest annual report, for 2015-16 financial year on the country's four major airports, found profits from car parking at Sydney Airport are 73.1 per cent of revenue, higher than Brisbane, Perth and Melbourne airports.

Each space at the Sydney airport reportedly earned $6,138 in profit a year.

Rod Sims, chairman of the ACCC, said Sydney Airport's monopoly gave them little incentive to reduce prices and left travellers with few options but to pay the fees.

"They face no competitive pressure, that's the issue, people really don't have much of a choice," he told the ABC.

"They've got market power and there's not much we can do about it."

Airport parking profits 2015-16

Airport Profit Margin* Profit* Sydney 73.1% $97.8m Brisbane 66.1% $58.8m Melbourne 59.0% $79.9m Perth 55.6% $35.4m

*earnings before interest, tax and amortisation

Mr Sims said travellers to and from the airport have limited alternative transport options including taxis and trains but even then faced additional fees.

"You can get a taxi in but of course the Sydney airport charges you over $4 per taxi," he said.

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Car parking prices offered online by the airport were found to be 30 to 40 per cent cheaper, but unprepared drivers were stuck paying the hefty fees.

"If you just turn up, you've obviously got not choice," he said.

"They [Sydney Airport] are in the delightful position from their point of view where they've got the car park monopoly and they get the ability to levy charges on the competitors, so they can levy fees on taxis for entering the airport, they can levy fees on the shuttle buses for the off airport parking.

"They are in a very strong position."

Sydney Airport denied it was taking advantage of being a monopoly by charging excessive prices.

Craig Norton, the general manager of parking at Sydney Airport, said it used a similar model to hotels and airlines and offered reduced fares for online bookings.

"You are going to get the best deal if you book online," Mr Norton said.

"Only 10 per cent of our passengers park and pay, there are many, many other ways of getting to Sydney Airport.

"Everyone gets that free drop off and everyone gets 15 minutes free to pick up."

The daily drive up price for parking at Sydney Airport, for the reported year, was $59.50 for 24 hours compared to $50.98 if you booked online.

Today, airport users would pay $60.50 for 24 hours.

Major Airports have 'tremendous' market power

The ACCC is not in a position to regulate the prices charged for parking and operates as a monitor of the four major airports.

Mr Sims said suggestions by the ACCC for governments to regulate the airports, which could mitigate the price hikes, have been rejected.

"The airports have got tremendous market power and are using that, and that's not illegal, but they are completely unregulated," he said.

NSW Premier Gladys Berejiklian said her Government had "done our bit" by investing in public transport and road infrastructure, and that it was the Federal Government's job to regulate the airport.

"As a State Government we've increased options to the airport, we've increased train services and we appreciate not everybody drives there," Ms Berejiklian told reporters.

Badgerys Creek first option a mistake: ACCC

The ACCC told the ABC the Federal Government should build Sydney's second airport at Badgerys Creek, not the Sydney Airport Group, to foster competition.

"If you have a common owner of the two airports that common owner would have an incentive to restrict investment at Badgerys Creek and delay Badgerys Creek so it can maximise its profits at Sydney Airport," Mr Sims said.

The Sydney Airport Group is looking at whether to exercise its option to develop and operate the Western Sydney airport.

"They should not have been given that first right of refusal, it's fundamentally anticompetitive and let's hope it doesn't get taken up and we do find an alternative owner," he said.