To cancel your JetBlue ticket, visit the official JetBlue website and log in to your account. Locate your booking and select "Cancel Flight." Follow the on-screen instructions to complete the cancellation process. Keep in mind that cancellation fees may apply, and refunds will depend on the fare type and timing of cancellation. It's advisable to review JetBlue's cancellation policy on their website or contact their customer service for specific details regarding your ticket cancellation.