The Steam Packet has cancelled all of its scheduled Dublin sailings between July 23 and October 1.
The decision follows ongoing infrastructure disruption at Holyhead Port and the resulting impact on berth availability and scheduling across the wider Irish Sea network, including Dublin Port.
The company said it had spent recent months exploring contingency options to maintain the route while protecting reliability across the wider network.
Managing Director Brian Thomson said: “While these infrastructure challenges are outside the Company’s control, our responsibility is how we respond to them.
“This has been an extremely difficult decision because we recognise the importance of the Dublin route not just for passengers, but for business and wider relationships between the Isle of Man and Ireland.”
He added: “The impact of the change is limited to a relatively small number of sailings and customers, with alternative travel options remaining available through the Company’s Larne operations. From July, the Larne route will also expand to three sailings per week year-round.”
Mr Thomson said the company is not pulling out of Dublin and that it remains “committed to the route and sailings via Dublin for Spring 2027 (inclusive of TT) are still available to book”.
Affected customers are being contacted directly and offered free transfers to alternative Steam Packet services or full refunds.
Sailings up to and including July 19 remain unaffected and will operate as normal.