Ian Crowder, the company's public relations manager, said that people need to let their insurers know about their travel arrangements so they can increase the cost of a premium for a few days if necessary.
However, he added that some comprehensive cover policies may mean there is no need for people to tell their insurers where they are going.
According to figures by the RAC Foundation, three million British motorists travel into mainland Europe via ferry and the channel tunnel every year.
The same study also found that UK motorists travelling in Spain and Portugal are three times more likely to be involved in a fatal accident.
Click here to run an energy price comparison, and see if you could be paying less for your gas and electricity.