The number for contacting JetBlue varies from one country to another. You could call their customer service representative at any point in time. They are available 24/7 to handle all your queries. The “Contact Us” section on the customer service page gives you a detailed list of the numbers according to the countries. If you are seeking compensation and haven’t booked your flight through their official website or at 1-888-JETBLUE, in such cases you have to dial +1–888–829–1280 within at least seven days after your flight’s departure date.