Where Does Frontier Airlines Fly? - Frontier Airlines operates a network of flights primarily within the United States, with additional routes to select international destinations. Domestically, Frontier Airlines serves numerous cities across the country, including major hubs like Denver, Las Vegas, and Orlando. They offer connections to popular destinations such as New York City, Los Angeles, Chicago, and Miami. Internationally, Frontier Airlines flies to destinations in Mexico, Canada, and the Caribbean, providing options for travelers seeking affordable and convenient flights across North America. For the latest routes and destinations, travelers should check Frontier Airlines' official website or contact their customer service.