The owner of Slattery's travel has confirmed that the travel agent has ceased trading.
David Slattery told RTÉ News that the decision was made because of the current trading environment.
He said the company are currently working with the Commission for Aviation Regulation to contact those clients who are currently abroad.
Mr Slattery said he did not know how many customers are currently abroad but that they were mainly in Europe and the US and that they will be able to travel home.
He said that because Slattery's is a licensed and bonded tour, the 500 people who have bookings with the company will be reimbursed via the Commission for Aviation regulation.
Those customers will be contacted in the coming days and Slattery's say they will either receive a full refund or be able to travel.
A spokesperson for the Commission confirmed that all 200 customers who are currently abroad have fully paid for their return flights and as a result are 'completely unaffected'.
They can also contact the company on 066-7186220.
Mr Slattery said the company deeply regrets the inconvenience caused.
The following note appears on the company's website:
'Slattery's Travel regrets to announce that it has ceased trading with effect from 15 September.
'As a licensed and bonded tour operator, any monies paid to Slattery’s Travel are secure and will be reimbursed via the Commission for Aviation Regulation.
'If you have booked a holiday with Slatterys Travel and have not yet departed, you will be contacted shortly . You will either receive a full refund or else you will be able to travel.
'Slattery’s Travel is currently working with the Commission to contact clients that are currently aboard.
'Slattery’s Travel deeply regrets the inconvenience that this has caused.'