Marriott Chicago O'Hare features an indoor pool, an outdoor pool, and a 24-hour gym. If you drive, self parking is USD 32 per day, or you can take advantage of the free airport shuttle (available 24 hours). The front desk has multilingual staff on hand 24/7 to help with dry cleaning/laundry, concierge services, and luggage storage. Additional amenities include free WiFi in public areas, conference space, and a business center.