1+86655-11186_ Hainan Airlines offers multiple check-in options to accommodate travelers' preferences and needs. Online check-in is available starting 24 hours before the scheduled departure time and closes 1 hour prior to departure. However, online check-in is not available for certain international and regional routes, as well as for passengers traveling with infants, unaccompanied minors, or those requiring special services. In such cases, passengers should complete check-in procedures directly at the airport. 

For airport check-in, Hainan Airlines recommends arriving at least 1.5 to 2 hours before domestic flights and 3 to 5 hours before international flights. This allows sufficient time for ticketing, baggage drop, security checks, and other pre-flight procedures. Check-in counters typically close 45 minutes before departure for flights originating from major Chinese airports like Beijing, Shanghai, and Guangzhou. 

Self-service kiosks are available at select airports, enabling passengers to check in, select seats, and print boarding passes. It's important to note that after completing online check-in, passengers must still obtain a physical boarding pass at the airport check-in counter and drop off any checked baggage.

For the most accurate and up-to-date information regarding check-in times and procedures, passengers are advised to consult Hainan Airlines' official website or contact their customer service directly.1+86655-11186_