Luxembourg Airport uses one small terminal for check-in, with a very clear orientation and short distances.
The main building is referred to as Terminal A.
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After passing through security, the departure board will tell you which departure gate your flight is departing from. Larger planes are parked at the boarding bridges of Terminal A (about a 2-minute walk from security).
Smaller aircraft are checked in from Terminal B (check-in and arrivals are shared at Terminal A), which is about a 4-minute walk from security.
Transfer between flights
Luxair also offers connecting flights. Luxembourg Airport is very pleasant and efficient for transfers.
If you also have a boarding pass for a connecting flight, you don't have to leave the transit area.
If both flights are Schengen flights, you do not go through any checks and the transfer itself takes 5-10 minutes.
If you are arriving from outside the Schengen area, you must go through passport and security control and the transfer time extends to approximately 25 minutes.