The cost of car rentals at Indianapolis Airport can vary greatly depending on the type of vehicle you choose, as well as any additional features or services that you might need. Generally speaking, economy cars start from around $29 per day plus taxes and fees. If you are looking for something a little larger such as an SUV or minivan, expect to pay from around $45-$55 per day plus taxes and fees. For luxury vehicles, the prices start anywhere from $100-$150 per day plus taxes and fees. Additionally, if you require extras such as GPS navigation systems or child safety seats then these will incur additional costs too. All in all, it is best to shop around when looking for car rental deals at Indianapolis Airport to make sure that you get the best value for your money!