Hainan Airlines usually does not charge any extra fee for airport check-in for most of its regular international and domestic flights. Passengers can check in at the airport for free by going to the airline’s check-in counters. This service is included in the ticket price, and you will not need to pay any extra cost just to check in when you arrive at the airport.

However, like many airlines, Hainan encourages passengers to check in online or through their mobile app before arriving at the airport. Online check-in is free and opens 24 hours before departure, closing 1 hour before takeoff. If you check in online, you can choose your seat, confirm your flight details, and download or print your boarding pass at home or save it to your phone. Online check-in helps save time at the airport and avoids long lines, especially during busy travel periods.

That said, there are a few special situations where a fee could apply. For example, if you're flying on a low-cost fare, using a special or discounted ticket, or traveling through a partner airline, there might be different rules. Some codeshare or joint flights might have service charges for certain actions, including changes or preferred services like printing your boarding pass or selecting premium seats. But for regular Hainan Airlines tickets, especially on international routes and standard domestic flights, airport check-in is free of charge.

It’s always a good idea to arrive at the airport early, especially if you plan to check in at the counter. Hainan Airlines recommends arriving at least 2 hours before departure for domestic flights and 3 hours before international flights. The check-in counters usually close 45 to 60 minutes before the flight, depending on the destination. If you're late, you might not be able to check in, and you could miss your flight.

In conclusion, Hainan Airlines does not typically charge for airport check-in, but it’s always smart to double-check your fare rules or contact the airline in advance if you’re unsure. For a smooth experience, try checking in online when possible and arrive at the airport with plenty of time to spare.