You are advised to first go to JetBlue Airways Cancellation Policy
You must cancel your ticket online at the airline's official website.
Log in to your JetBlue account with your credentials.
After logging into your account, you will see the option to cancel your JetBlue reservation. Select it by clicking on it.
After that, you will be transferred to a different page.
You can cancel your JetBlue reservation on this page. Press the continue button to continue.
After that, a pop-up box will appear prompting you to provide your full name and confirmation number.
After entering all the required information, click the Continue button.
It is recommended that you double-check your information before submitting it.
Cancel your ticket after you've double-checked everything.
The airline will notify you once your cancellation request has been accepted.