Find great value on Frontier Airlines flights from HOU to DEN when you book with CheapOair! Denver is what we call a complete entertainer. The vibrant city is famous for its beautiful lakes, rare wildlife and abundance of recreational opportunities. Enjoy fun-filled time at the Elitch Gardens Amusement Park which offers thrilling rides and exciting shows for family entertainment. Explore rare wildlife in the Denver Zoo which is spread across an area of more than 80 acres and is home to more than 4000 animals. Art lovers should definitely fix a date with the Denver Art Museum which contains more than 60,000 art objects including American and European masterpieces.