From Denver and beyond. Frontier airlines began as a small hometown carrier and now flies to more than 75 destinations in the United States, Costa Rica, Jamaica, The Dominican Republic and Mexico. The company employs more than 3900 aviation specialists and professionals, all of whom are the pinnacle of great customer service. Frontier Airlines itself is also regarded for a wonderful safety record. Whether you're flying to a big city or your small hometown, Frontier Airlines will get you there.