Discount air fare agency Cheap Flight House ceased trading on Friday.
The London-based company operated under a series of trading names and website addresses.
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The firm traded under the names Budget Flights UK, Cheap Travel Shop, Flight Solution, Flights International UK and Travel Shop UK.
It also ran the websites saudiair.co.uk, chinasouthernair.co.uk, flightsinternationaluk.com, flightsolution.co.uk, travelshopuk.co.uk, cheapflighthouse.co.uk, cheaptravelshop.co.uk, budgetflightsuk.co.uk.
The company held an Atol with the Civil Aviation Authority, which announced the failure.
The regulator said on its website: “We are currently collating information from the company and will be updating this page in due course.”