You can modify your travel date, time, and/or destination online through Manage Trips if you purchased your ticket directly from JetBlue, as detailed below.
the website JetBlue
Go to the Manage Trips tab.
Code of confirmation
Select "Find Flight" from the menu.
Choose the flight reservation you want to modify.
Follow the instructions to make the necessary modifications (including date, time, and/or destination).
Through the mobile app, you may also make Change to your JetBlue flight reservation.