London-based operator Silverbird Travel has ceased operations following mounting financial pressure.
The tailor-made holiday specialist also traded as Lanyard Travel, Royal Orchid Holidays and Oriental Vacations.
Silverbird predominantly offered trips to south-east Asia.
The company was a member of Abta and held Atol number 2852 with the Civil Aviation Authority.
The CAA said passengers who had booked packages including a flight might be able to claim a refund.
Abta said customers who had booked travel not including a flight should contact Abta claims department for advice.
Any claims would have to be made before October 20th.
Passengers due to travel with the operator to Singapore on British Airways and Singapore Airlines today would still be able to travel, said the CAA.
However, there would be no more flights after that.
Silverbird is the sixth long-haul operator to fail this year, following African Safari Club, Global Travel Agency, Rion Travel, Grus Travel and Oriental Panorama.