Yes, cancel up to 22 days prior to pick-up, the cancellation is free of charge and you'll receive a full refund.
More info about this and the details of our cancellation policy can be found in our Terms & Conditions.
You can always update or change the dates of your booking. Spaceships doesn't charge a change fee. However, if you do decide you need to cancel your booking, info about how to cancel can be found here.