Wales and Northern Ireland are linked by a ferry route due to the strong demand for crossings.
Stena Line said it will offer a weekend schedule between Holyhead and Belfast from June 25th.
One of the company’s newest ships, the Stena Estrid, will operate the eight-hour crossings and carry a combination of cargo and leisure traffic.
This comes amid “very high demand” on the Belfast routes to and from Liverpool and Cairnryan in Dumfries and Galloway, Scotland, the company said.
Fares on the Holyhead-Belfast crossings start from £ 130 for a car and driver.
The services are scheduled to run until July 18.
Paul Grant, Stena Line Commercial Director, said, “We are pleased to announce details of our new temporary service between Holyhead and Belfast.
“The much anticipated summer getaway for travel begins and we are very encouraged by the current booking trends.
“The current travel restrictions between the UK and Ireland have created a lot of catching up to do in travel so hopefully the addition of this new route will help provide another option for people taking friends, relatives or a break, as well as an attractive option for ours Freight customers. “