Excellent choice. Adding a prepaid, open-date ferry voucher to your booking is the easiest way to book the ferry to go from the North to the South Island or the other way around.
As soon as you know when you would like to use this one-way voucher you can send us a request to book the ferry for you. As soon as we have received your request we'll check availability with the ferry company. We'll update you as soon as possible, but always within 12 hours. We'll do our best to book you in on your preferred sailing dates but sometimes (especially in the busy summer season) that isn't possible as your booking class may be sold out. We'll then offer you an alternative booking class (which means a ferry rate change) or try to get you onto the ferry on another day at the same rate.
We recommend sending in your ferry dates as soon as you know 'em, especially if you are travelling in the busy summer season. As summer is a busy season, some ferry dates/times will be booked out.