Aer Lingus is to suspend its Dublin to Los Angeles route from November.
The airline cited higher fuel costs, a weak US dollar and the uncertainty of the economic climate as reasons for the cutback.
It is also emerged that the company will cut its capacity on long-haul US routes by 15% in the winter.
Aer Lingus Chief Executive Dermot Mannion said the deferral of long haul growth is the most sensible option at the moment:
He said the decision not to grow the long-haul fleet was made on a "prudent, conservative basis.