Denver International Airport (DEN)
Approximate taxi fare: $117 USD
Uber fare: Average $60 USD
Shuttle Ride: $35 USD
Situated 42 miles from Boulder, Denver International Airport is one of the world's greenest airports, boasting a roof made out of a Teflon-coated, fiberglass material that's as thin as a credit card. Easily distinguished by its peaked roof reflective of snow-capped mountains or teepees, Denver International is the fifth busiest airport in the U.S., as well as the largest airport site in North America and the second largest airport site in the world. Denver International accommodates nonstop services to more than 170 destinations worldwide, including major markets in the U.S., Germany, Iceland…