If you booked your trip seven days or more before the intended departure date, you have 24 hours from the time you made the reservation to cancel without incurring a fee. To qualify, the entire booking must be cancelled (not applicable to JetBlue Vacations reservations). https://support.zendesk.com/hc/en-us/community/posts/7562979563674--urgent-JetBlue-airlines-cancellation-policy-1-716-791-9668-how-to-get-refund

https://support.zendesk.com/hc/en-us/community/posts/7558802939674--1-716-791-9668-JetBlue-Airlines-Cancellation-Policy-and-fully-Refund-Policy JetBlue Airlines is well-known in the United States as a low-cost airline that offers many options for booking flights to numerous locations. If you bought your airline ticket on the official website but do not want to fly on a specific date and time, you will be given the opportunity to cancel your journey soon. You will receive thorough information and assistance in cancelling your airline ticket by comprehending the cancellation rules, which you must carefully read. It allows you to cancel your flight ticket within 24 hours after booking and receive a refund without incurring any fees. Similarly, it provides more data about the airline cancellation policy, which you must study to prevent unnecessary concerns when cancelling your ticket and receive

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https://www.flyinguidelines.com/flights-cancellation/jetblue-airlines-cancellation-policy/