How long before the flight do I have be at the airport?

If you have luggage to be checked in or have not checked in online, you have to be at the airport in a time when you give up your luggage to the counter or receive your boarding card it should be obvious that there is at least one hour till departure time.  We therefore recommend that you be at the airport 2.5 hours before departure for international flights and 1.5 hours for domestic flights.

I have checked in Online and I have luggage what should I do? 

If you have a luggage to give to the plane even though you checked-in online, you still need to apply to the check-in counter. Here, a separate counter is usually open for passengers who have checked in online.