One A350 is due in October, but SriLankan no longer wants to aircraft.
"We cannot operate them. We will make a bigger loss if we try to operate them," SriLankan Chairman Ajith Dias told reporters.
SriLankan has already cancelled one aircraft leased from AerCap paying a penalty of 17.5 million dollars.
The aircraft was ordered by the ousted Rajapaksa regime, when ex-President Mahinda Rajapaksa's brother-in-law Nishantha Wickremasinghe was chairman.
SriLankan had ordered another 4 A350s directly from Airbus.
SriLankan's new Board and management are focusing on cutting losses. The airline had already stopped flying to Mattala and are also cutting loss-making routes.
(Economynext)