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 Gateway Arch (18 mi) and Laclede's Landing (16 mi). Free WiFi is available throughout the property. Guest Services Breakfast is provided by the property, and guests appreciate the attentive staff and excellent service support.