The best cheapest luxury car to rent can vary depending on your location, the time of year, and the rental company you choose. However, some of the most popular and affordable luxury cars to rent include the Audi A4, BMW 3 Series, Mercedes-Benz C-Class, and Lexus ES. These cars offer a balance of style, performance, and comfort while also being relatively affordable to rent. It's important to shop around and compare prices from different rental companies to ensure you're getting the best deal. Additionally, consider booking in advance and being flexible with your rental dates to potentially save even more money