Ameristar Casino Resort Spa St. Charles offers an exceptional gaming and entertainment experience in the St. Louis metropolitan area. The property features a 130,000-square-foot casino; AAA Four Diamond full-service luxury suite hotel with 400 well-appointed rooms, an indoor-outdoor pool, seven dining venues; 12 bars, an entertainment venue, a full-service luxury day spa, and a 20,000-square-foot conference center.