Hainan Airlines allows passengers to check in online starting 24 hours before the scheduled departure time. Online check-in closes one hour before the flight departs. This option is available through the airline’s website and mobile app, where travelers can select seats, manage baggage, and obtain their boarding passes electronically. For those who prefer airport check-in, Hainan Airlines opens its counters approximately two hours before domestic flights and three hours before international flights. The check-in counters generally close 40 minutes before domestic departures and 60 minutes before international departures. At select airports, self-service kiosks are available starting about three hours before the flight and close 30 to 45 minutes prior to departure. These kiosks provide quick check-in and seat selection but may not accommodate passengers with special needs or those traveling with infants. Regardless of the method used, Hainan Airlines advises passengers to arrive at the airport at least two hours before domestic flights and three hours before international flights. This allows sufficient time for check-in, security screening, and boarding. Passengers should also prepare all necessary travel documents, including passports, visas, and any required health forms. Checking in early and arriving on time helps ensure a smooth and stress-free start to the journey with Hainan Airlines.