China Southern Airlines allows passengers to check in online for most flights. Online check-in opens 24 hours before the scheduled departure and closes one hour before the flight. You can check in on the airline’s website or through the mobile app by entering your ticket number and last name. During online check-in, you can select your seat and receive a boarding pass that you can save on your phone or print at home. If you have checked baggage, you must drop it off at the airport baggage counter before the check-in deadline. It is recommended to arrive at the airport at least two hours before domestic flights and three hours before international flights to allow enough time for baggage drop, security, and boarding. Some flights, such as those to or from Hong Kong, Macao, Taiwan, or certain connecting flights, may not offer online check-in. Passengers needing special assistance or traveling with infants are usually required to check in at the airport counter. Always check your flight details to confirm if online check-in is available. By using online check-in when possible, you can save time and reduce stress on the day of your flight.