Flight-only specialist Holiday Routes has failed with 30 passengers overseas.
The company, which operated the websites holidayroutes.com and holidayroutes.travel, had 81 forward bookings with more than 200 passengers.
Holiday Routes, which served destinations including India, Sri Lanka and Ghana, ceased trading on May 22.
Passengers overseas holding valid scheduled airline tickets can return to the UK without a problem, according to the Civil Aviation Authority.
Those due to fly who have been issued with scheduled, no-frills or e-tickets will be able to travel as normal but will not be entitled to make a claim via the Atol protection system.
Passengers are advised to check with their airline, the CAA said.
Others with flight bookings who have been issued with an Atol Certificate which states ‘Flight-Only sale’ but have not been issued with flight tickets, may be entitled to claim from either the CAA or their credit card provider.