The company received information of possible action by port authorities and has been contacting the 1,961 travellers affected and offering alternative sailings on Friday and Sunday.
Elwyn Dop, Condor Ferries’ executive director of operations, said: ‘We are very disappointed that through the actions of others our services are being disrupted, so we are liaising with everyone and providing help with changing their travel plans.’
The sailings cancelled on Saturday are the St Malo to Jersey 7.30 am and 5.15 pm departures and returns at 8.35 am and 6.35 pm with connections from Guernsey.
The Commodore Goodwill weekly freight service to St Malo has also been cancelled.
The situation is unrelated to the action by port stevedores last December and January that caused several cancellations to Condor’s sailings.
Further updates will be made as soon as information becomes available.