You can check in for a JetBlue flight starting 24 hours before the scheduled departure time. Online check-in is available through the JetBlue website or mobile app, allowing you to enter your booking details, select or change your seat, and add checked baggage if needed. For domestic flights, online check-in closes 40 minutes before departure, while for international flights it closes 60 minutes before departure. If you are traveling to or from Cuba, check-in may close earlier due to additional requirements. If you have only carry-on luggage, you can proceed directly to security after checking in online. However, if you have checked baggage, you must drop your bags off at the airport bag-drop counter before the deadline, which is 40 minutes prior to domestic flights and 60 minutes prior to international flights. At the airport, you can also use self-service kiosks to check in, print boarding passes, and tag checked bags. These kiosks generally open several hours before departure and provide a quick alternative if you did not check in online. JetBlue offers curbside check-in at certain airports, where you can check in and drop off your bags at the curb, which is convenient during busy travel times. Staffed check-in counters are available at all airports for those who need assistance or prefer personal service. These counters open about three hours before departure and close 40 minutes before domestic flights and 60 minutes before international flights. JetBlue recommends arriving at least two hours before domestic flights and three hours before international flights to allow enough time for check-in, baggage drop, and security screening. For flights to and from Cuba, passengers are advised to arrive even earlier, sometimes up to four hours before departure. Boarding gates usually close 15 minutes before domestic flights and 20 minutes before international flights, so it is important to be at the gate early. If you miss the gate closing time, you may not be allowed to board even if you have checked in. In summary, JetBlue check-in opens 24 hours before the flight, with multiple options including online, kiosk, curbside, and counter check-in. Arriving early and following check-in deadlines helps ensure a smooth and stress-free start to your trip.