By RNZ

Passengers crossing Cook Strait are being warned rough seas could once again make the journey tough going.

A run of southerlies has led to delays and cancellations in recent days, although trips are going ahead on both Interislander and Bluebridge ferries on Monday.

Bluebridge said while the huge swells were starting to ease sailings might still take longer than normal — with delays to some services — and be uncomfortable.

Passengers on affected sailings have been contacted.

“We appreciate that a lot of people are travelling with us over the holidays, and we are sorry that these weather-related disruptions may impact your travel plans,” the ferry said on its website.

“Our top priority is ensuring everyone’s safety while minimising the impact on our customers.”

Some Interislander ferries were cancelled on Sunday but services are running as usual today.

It said the large swells in the strait should start to ease tomorrow.

It recommended sitting towards the rear of the ship where there was less movement, not sailing on an empty stomach, sipping ginger ale during the trip, and trying seasickness pills.