The airline said that the disruption that holidaymakers experienced between June and August was likely to continue into next summer as the economic crisis intensified.
Commenting, Stephen McNamara, Ryanair’s head of communications, said that the cheap flights carrier had "come to the rescue" of thousands of flight passengers this summer after their tour operator or airline had gone bust without warning.
"As we launch our summer schedule we advise passengers not to risk their summer holiday plans by booking with flaky airlines or shoddy tour operators which they know little or nothing about," he said.
Ryanair’s summer schedule offers passengers over 800 routes to 26 European countries, with 50 million seats having been made available between March and October.
The airline announced last month that it would be launching a new daily service between London Gatwick and Dusseldorf (Weeze) on January 7th.