You cannot delete your account.
Try to contact them:
Go to http://www.priceline.com/customerservice/customerservice.do and click the “Contact Us” tab.
Fill out the form, and select “My Profile” from the “Product” list.
URLS:
http://priceline.com
Please note that AccountKiller.com is not associated with the business listed on this page. AccountKiller provides easy-to-understand instructions and guides on how to cancel charges and relationships from the list of businesses on our site, we have no affiliation with these businesses.