JetBlue check-in time are flexible, but you should arrive at the airport early if you are checking bags or traveling to or from Cuba. For domestic flights, you can check in online 24 hours before departure or at the airport up to 60 minutes before departure. If you are checking bags, you will need to check in at the airport at least 40 minutes before departure. For international flights, you can check in online 24 hours before departure or at the airport up to 90 minutes before departure. If you are checking bags, you will need to check in at the airport at least 60 minutes before departure.