We encourage you to check in at least two hours before your departure time. Most airline check-in counters open at least two hours before your flight. Some airlines also offer early check-in.
You may also be able to check in online, in which case you can confirm your flight and choose your seat before you arrive at the airport, so you only need to collect your boarding pass and deposit your hold baggage when you arrive. If you check in online, you may choose to arrive at the Departure Transit Hall one hour before flight departure (or 45 minutes before departure, if you have no hold baggage).
As check-in operations and requirements vary by airline, do check with your airline representative or ground handling agent for more information.
Having said that, we do encourage you to check in early to enjoy all the shopping, dining, services and attractions available at the airport.