More than 100 locations in the United States, Mexico, Central America, and the Caribbean are served by Frontier Airlines. Popular vacation destinations like Cancun and San Juan are connected to major U.S. Where Dose Frontier Fly? cities including Denver (the airline’s hub), Orlando, Las Vegas, and Miami by Frontier, which is well-known for its affordable tickets. In order to save money, the airline mostly offers point-to-point service, frequently stopping at smaller airports like Ontario, California, and Trenton, New Jersey. Although Frontier has flights to Europe and Hawaii, its network mostly serves North America and the Caribbean.