An Illinois car rental is easy when you choose SIXT. We offer great locations in the state, including in Chicago, and at major airports like Chicago O'Hare International Airport. We operate with flexible hours that include offering 24-hour returns at some locations. Our fleet has new-model vehicles, with most cars being an average of only three months old. Whether you need a small sedan for city driving or a spacious SUV with room for a family, we have just the right type of car for you.