Book a rent a car at Boston International Airport and get behind the wheel of a premium vehicle at an affordable price. Our fleet includes full-size and premium sedans to fit solo travelers and families alike. When booking, check out our selection of optional add-ons that include an additional driver, extra protection, child seats, GPS, Express Toll Unlimited and SIXT Connect Wi-Fi service. Driving in Boston and the surrounding area can be stressful, so adding both GPS and Express Toll Unlimited can help make your journey easier and faster.