Not a problem! Be sure to let the agency know. Then drive to the designated drop-off parking lot at the airport and park the car in the marked area for that particular agent. A representative will come to do a walk-through of the vehicle, collect the keys and log the mileage. Please keep in mind that no deductions to your charges will pass because the car was returned early. You will be charged for your original booking period. Search car hire on KAYAK