Frontier Airlines is the best way to fly. We're committed to providing low fares and exceptional service while delivering a memorable travel experience. Fly Frontier to more than 90 destinations in the United States. Frontier Airlines is the only major U.S. airline that offers low fares. We have the best deals on flights, vacation packages. Book your next flight with us and experience a whole new way to fly! Frontier Airlines is a U.S. based, ultra-low-cost airline. We offer the cheapest flights and travel packages to destinations in US.