The Steam Packet has now released its full 2020 timetable, with crossings now on sale from March 27 onwards.
Sailings up to March 26 were released earlier in October.
From next year, there will be no weekend supplements for passengers travelling between October and March.
This means passengers travelling with their car can save up to £25 each way when sailing over the weekend during these months.
In early spring 2020, fast craft Manannan will resume her usual seasonal services, beginning regular sailings into the heart of Liverpool on March 27. The first sailing of the year to Dublin is scheduled for March 28 and to Belfast for April 8.
Ben-my-Chree will operate twice daily crossings between Douglas and Heysham throughout the year.
This follows the announcement in September that essential engineering works taking place at Birkenhead will prevent the vessel from berthing for her scheduled weekend winter sailings.
The Steam Packet will operate an increased number of sailings to Heysham at weekends throughout winter, in addition to offering an express return coach service between Heysham and Liverpool on Saturdays and Sundays for foot passengers.