A Fremantle travel agency at the centre of a ticketing furore is now in liquidation, the WA Department of Commerce says.

Sky Air Services last week closed its doors after dozens of customers complained the agency had not properly booked flights and accommodation they had paid for months in advance.

A total of 120 customers have now come forward, with combined losses totalling about $420,000.

Those customers have been advised to contact liquidator DCS Advisory to be registered as creditors.

Consumer Protection issued urgent advice about the travel agency on Thursday after customers reported being left stranded in Europe, having their flights and accommodation cancelled and receiving foul-mouthed abuse from the company on Facebook.

Warning: This story contains strong language

Some Sky Air Services passengers turned up at airports but were unable to board flights because they had been cancelled due to non-payment, or never booked.

One young member of the Melville water polo team had been unable to return from Europe, and the club eventually had to pay $2,000 for new flights back to Perth.

The travel agency's Facebook page was taken down on Thursday. The page detailed a litany of customer complaints and some colourful responses from the company.

"You are a f***ing pain in the ass hard maintenance anyways! good riddance and bon voyage!!" the company wrote in response to one woman's complaint.

Another person who complained about high prices received a response that read: "Inflated price? u mean 20dollar commission? ... we can take your 20 dollars and wipe our butts with it!"