The check-in desk for your flight will open 2 hours before the scheduled departure time.
You should arrive at your airline's check-in desk between one-and-a-half and two hours before your flight is scheduled to depart to make sure that you have plenty of time to check in and that the flight leaves on schedule. If you arrive later than this, the airline can refuse to allow you on board.
Please contact your airline or tour operator to find out when the check-in desk for your flight closes.
You should be at the gate at least 40 minutes before your flight departs.