About half of the 150 people killed on March 24 were German.
Lufthansa, Germanwings' parent company, had planned to bring the remains to Germany on June 9 and 10, allowing first funerals to take place June 12.
Elmar Giemulla, a lawyer representing several families, said today that "anger and despair are growing" among the relatives, especially since no new date for the transfer has been set.
Germanwings spokesman Joachim Schoettes told The Associated Press the delay was caused by errors in the official death certificates, which rendered them invalid.