Where Does Frontier Fly operates flights to over 100 destinations across the United States, Mexico, and the Caribbean. Major cities in its network include Denver, Orlando, Las Vegas, and Philadelphia. Frontier also offers seasonal flights to popular vacation spots such as Cancun, Punta Cana, and San Juan. With its primary hub in Denver, Colorado, the airline emphasizes low-cost travel while providing a range of domestic and international options. Whether you’re planning a business trip or a beach getaway, Frontier’s extensive route map can connect you to your desired destination affordably.