Once you've booked your trip, you're free to pay towards your balance whenever you like.
If you'd prefer to pay the full amount straight away, you can. Or, if you'd rather spread the cost, you can make payments as and when it suits you. Many customers choose to pay off a little each week or month by logging into their NUCO account and making additional payments along the way.
The only requirement is that your full balance is paid by your payment deadline, which will be shown on your booking confirmation and on your booking summary.