Abta member travel agency BTY Ltd, based in Leeds, has ceased trading.
BTY traded as Number One Travel and also as Independent Travel Advisors, Golf 55 International, Intersport Holidays and Medjugorje Pilgrimages.
There are no details on the number of bookings or customers affected, but BTY sold most of its holidays as an agent on behalf of other tour operators.
The company was established in 1998.
Abta is advising customers who booked a package holiday through BTY to contact the tour operator named on their paperwork or Atol Certificate.
The tour operator should be able to confirm they have the booking and will be responsible for the booking going forward.
Customers requiring further assistance are advised to contact Abta on 020 3758 8730 or email claimsrequest@abta.co.uk
Abta warned that the large number of recent company failures and “an exceptionally high number of customer claims” means claims “can take up to six months to be processed”.
The association said: “This is not usually the case, it is simply down to the volume of claims submitted.”