Where Does Frontier Fly the United States, Mexico, Central America, and the Caribbean. Their primary hub is Denver International Airport, but they also have significant operations in cities like Orlando, Las Vegas, and Philadelphia. Popular destinations include major cities like New York, Los Angeles, and Miami, as well as vacation spots such as Cancun, Punta Cana, and San Juan. Known for offering low-cost fares, Frontier serves both leisure and business travelers, providing a range of domestic and
international options for budget-conscious flyers.