The airline and operator had been due to launch flights from Bristol on 1 April.
New services at what will be its 10th UK base are now scheduled to get under way on 1 July.
The group on Thursday (18 February) said it had been "hugely encouraged" by the response to its decision to bring its flight and holiday proposition to Bristol.
Customers affected by the decision will be refunded automatically.
"We would like to thank our valued customers and independent travel agency partners for their patience and understanding," said the airline and operator in a statement.
"There is huge pent-up demand for our flights and holidays at Bristol airport, and we are very excited about launching and growing successfully."
