Brittany Ferries has said its passenger service out of Cork to France will not not resume at the end of March as planned.
It said due to the current travel restrictions, the service will be kept under review and it expects the service will recommence in mid-May.
Freight only sailings out of both Cork and Rosslare will continue as scheduled.
A number of their other passenger services between the UK, France and Spain will also be suspended.
In the coming days, Brittany Ferries said it will contact customers who hold bookings on affected sailings, to offer alternative travel or a refund.
"Naturally we very much regret any inconvenience that these changes will cause our customers," said Christophe Mathieu, Brittany Ferries' CEO.
"We had hoped for a return to service for all our routes in mid-March, but the reality is that most people are simply unable to travel at this time.
"Booking levels are extremely low and we are relying on loans to carry us through this difficult period and it is therefore simply not viable to run loss-making routes at this time," he said.
Brittany Ferries says it will remain a predominantly freight-only service for now.
Only 20% of its annual turnover comes from freight traffic, with around 80% usually generated by holidaymakers.
