Where Does Frontier Airlines Fly To - Frontier Airlines operates a large network of both domestic and international destinations. As of late 2025, the airline serves over 100 destinations: about 86 within the United States and around 18 international destinations across the Caribbean, Central America, and parts of Latin America. Domestically, you can fly Frontier to major U.S. cities like Denver International Airport (DEN), Orlando International Airport (MCO), Las Vegas Harry Reid International Airport (LAS), Atlanta Hartsfield‑Jackson International Airport (ATL), Chicago, Phoenix, Miami, Philadelphia, Dallas/Fort Worth, and many others. For international travel, Frontier links the U.S. with beach- and resort-destinations such as Cancún International Airport (CUN) in Mexico, Punta Cana International Airport (PUJ) and Las Américas International Airport (SDQ) in the Dominican Republic, Guanacaste Airport (LIR) and Juan Santamaría International Airport (SJO) in Costa Rica, as well as destinations in Jamaica, the Bahamas, and Central American countries like Guatemala and El Salvador. Frontier uses multiple hubs and focus cities, including Denver, Orlando, Las Vegas, and Philadelphia, to support its route network. Many routes are seasonal, catering to leisure and holiday travel, especially those going to holiday-destination airports.