Hainan Airlines allows passengers to check in using several methods, each with its own time window. For online check-in, passengers can check in as early as 48 hours before departure for international flights and from 24 hours before departure for domestic flights. Online check-in usually closes 2 hours before an international flight and 1 hour before a domestic flight. This option is available through the Hainan Airlines website or mobile app, where travelers can select seats, manage baggage, and receive boarding passes electronically. For those who prefer to check in at the airport, Hainan Airlines opens its airport check-in counters about 2 hours before domestic flights and about 3 hours before international flights. The counters usually close 40 minutes before departure for domestic flights and 60 minutes before departure for international flights. Passengers who wish to use self-service kiosks at select airports can typically do so starting from 3 hours before departure, with availability ending 30 to 45 minutes before the flight. These kiosks offer fast check-in and seat selection but may not be suitable for passengers with special needs or those traveling with infants. Regardless of the check-in method, Hainan Airlines recommends that passengers arrive at the airport at least 2 hours before a domestic flight and 3 hours before an international flight. Arriving early allows time for check-in, security checks, and boarding. Passengers should also ensure they have all necessary documents such as a valid passport, visa, and any health or travel forms required by their destination. Choosing the right check-in method and arriving on time helps to avoid stress and ensure a smooth start to the journey. Whether using online check-in, kiosks, or airport counters, passengers are advised to plan ahead and follow the airline’s check-in deadlines closely.