Welcome to MileMarker, our online distance utility. We've compiled airline and geographical data into an easy-to-use tool that allows you to find the air mile distance between two locations. Want to know the air miles between Denver International Airport (DEN) and Paris (CDG)? Just enter the two cities (or airport codes) in the appropriate spaces below (or, if you are connecting through Chicago on the trip, enter all three airports) and click How Far?