The Steam Packet company says all its sailings until at least Wednesday have been disrupted by tidal conditions.
All of the Manxman's Tuesday sailings will leave Douglas half an hour to an hour later than planned, while it will set out from Heysham an hour earlier.
On Wednesday morning, her 2.15am sailing from Heysham will leave port at 1am.
The company says the reschedulings have had to be made because of tidal conditions in Douglas harbour.
Roof work to shut Castletown shopping street
Church unveils plans to modernise facilities
Are Mountain Road closures harming Ramsey?
No whey! Creamery says goodbye to much-loved butter
Roofing Outlaw plans Isle of Man franchise
Can you help find fly-tippers?
Aldi and Lidl on Summerland site?
Corrin leaps to silver and breaks national record at British Indoor Championships