JetBlue Airlines advises customers to purchase their tickets at least seven days prior to the departure time. If you decide not to fly on the scheduled day and time, you can cancel your flight ticket online. The passengers cancel their flights for a variety of reasons, and they immediately notify the airline of the refund. JetBlue does, however, typically allow you to modify or cancel a ticket up to 24 hours before takeoff and submit a refund request to receive a refund within a specific time frame. It is important to put your fears to rest by simply reading the JetBlue Cancellation Policy, which offers fantastic discounts and advice on how to change your travel plans without running afoul of the law.