Comfortable Accommodations Fairfield by Marriott Inn and Suites O Fallon IL in O'Fallon offers air-conditioned rooms with private bathrooms, free toiletries, and modern amenities including a coffee machine, refrigerator, and work desk. Leisure Facilities Guests can enjoy a fitness center and indoor swimming pool, complemented by a 24-hour front desk and streaming services. Additional features include a sofa bed, walk-in shower, and seating area. Convenient Location Located 5.6 mi from MidAmerica St. Louis Airport, the hotel is near attractions such as the St. Louis Gateway Arch (19 mi) and Laclede's Landing (16 mi). Free WiFi is available throughout the property. Guest Favorites Guests appreciate the breakfast provided by the property, the attentive staff, and the excellent service support.