Find great value on Frontier Airlines flights from DTT to DEN when you book with CheapOair! When was the last time you experienced unadulterated fun, if it has been a long time, then plan a vacation in the Mile High City of Denver. Plan a day trip with your family to the Elitch Gardens Amusement Park which offers many exciting rides and entertaining shows. Visit Denver Zoo which is spread across an area of more than 80 acres and is home to more than 4,000 animals which includes rare and endangered wildlife. Don't forget to pamper yourself with high end clothing, electronic gadgets and much more at the Cherry Creek Shopping District.