JetBlue waives a fixed cancellation cost if a passenger cancels a flight within 7 days of deviation time. The charge is$ 100 for familial flights, while the price is$ 150 for foreign travel. For further information on cancellation costs currently's the JetBlue customer support number +1-866-901-7017. Also, you can read our blog Cancellation fee JetBlue – Flyavionic for all the advice.