Air Miles Calculator helps you to find how many miles is from an airport to an another airport. See also a map, estimated flight duration and the time difference between cities. Search by airport name, city or IATA airport code. Distance calculator. Travelmath provides an online travel distance calculator to help you measure both flying distances and driving distances. You can then compare the two results to see the difference. Flight distance is computed from a GPS-accurate great circle formula, which gives you the straight line distance "as the crow flies".