Use a Price Comparison Website – While individual rental car companies allow you to book a vehicle directly through their websites, if you want to save as much money as possible on a rental car at the Chicago Airport, your best option is to use a price comparison website. The reason you will save more money by using a price comparison website is because instead of guessing which company is offering the best deal, you can see an actual comparison of the rates being offered by each company. Popular price comparison websites include VroomVroomVroom.com, Priceline, Orbitz, Hotwire and Expedia.

Book Early – Simply put, the sooner you book your Chicago Airport rental car, the more money you will be able to save. As the time for your trip draws nearer, the price of booking a rental car will increase. This is why people who wait until they arrive at the airport to get a rental car end up paying the most.

Use a Credit Card – When it comes to renting a car, always use an actual credit card instead of a debit card. By using your credit card, you will give yourself several types of protection that a debit card simply can’t offer.

Inspect Your Car Before Driving Away – If you see any damage on your rental car, make sure to notify the company before you leave their parking lot.

Fill Up the Tank Yourself – To avoid paying an inflated rate, before you return your rental, be sure that you fill it up yourself. And because gas stations near the Chicago Airport charge more, you are better off filling it up before you get close to the airport.