Six Flags Membership Rewards is free for all Gold Plus, Platinum, Diamond and Diamond Elite Members living in the US who are over the age of 12. To begin the cancellation process, click the green button below. We'll let you know. If your account is in arrears, you will not be able to cancel until 24 hours after you bring it up to date. Lost Password First time here? Welcome! Members must have their own email address to participate. Use this page when you are ready to cancel your Six Flags Membership account. You must be current on your payments; You must have been a Member at least 12 months; You must be the owner of the account; Not sure if you meet the requirements?