Perth Airport has been rated as one of the worst major airports in the country for quality of service in an Australian Competition and Consumer Commission (ACCC) report.

A number of services were rated as "poor", including most indicators for its international terminal, such as check-in services, baggage processing and the availability of enclosed bridges connecting passengers from the terminal to the plane.

Perth Airport's overall average quality of service rating dropped slightly but remained at "satisfactory", equalling Melbourne's Tullamarine airport.

Brisbane Airport was the only monitored airport to achieve an overall rating of "good".

The ACCC also assessed Sydney's Kingsford-Smith airport as part of its annual airport monitoring report for 2013-14.

Perth Airport's chief executive, Bradley Geatches, said the facility needed to be judged in comparison to the nation's other major airports.

"[The report] said the quality of service is satisfactory; it also highlights that passengers rated the airport as good," he said.

"The report actually shows that with Sydney, Melbourne and Perth, there's not much difference at all, with Brisbane being better than the three.

"That's a more accurate portrayal of what the report is saying.

"We can shoot for the stars and have the best airport in the world, but we'll have quite high airport charges flowing into fares."

Mr Geatches said a $338 million project to accommodate Virgin Australia at the international terminal should be completed by the end of the year and would improve the passenger experiences.

"Our international terminal generally rated below what we would want it to be," he said.

"That's why most of the significant developments we have underway are focussed on that terminal."

Decline in domestic passengers attributed to mining slowdown

Perth was the only assessed airport to record a reduction in its domestic passenger numbers in 2013-14, to 10.8 million, a drop of 1.2 per cent.

It was the first time it the recorded a decline in domestic passenger numbers in more than a decade.

The airport also recorded the overall lowest growth in passenger numbers out of all the airports assessed.

Overall passenger numbers increased by 1.5 per cent, with almost 15 million passengers travelling through Perth Airport.

Mr Geatches attributed the decrease in domestic passengers to the slowing down of the state's mining sector and a drop in the number of fly-in, fly-out workers.

"That's to be expected — the demand for airport services is closely correlated with economic growth," he said.

Perth Airport's profits more than halved last financial year, dropping to $190 million.

The ACCC points out the airport recorded a revaluation loss of $54.9 million on investment property last financial year, which contributed to the reduction in profit.

The regulator revealed Perth Airport earns $5.47 per passenger.

It also found the airport made $2,345 from each of its car bays in 2013-14, with prices for short and long-term parking steadily increasing since 2003.

A number of projects are on the horizon for the airport including the consolidation of all commercial air services into a single precinct and a proposed new runway.