Washington Dulles International Airport (IAD) is among the busiest airports in America, processing millions of passengers annually. Lufthansa Washington Dulles International Airport phone number (IAD) +1-703-572-2700 Whether you're a traveler needing help or a business partner looking for information or someone wanting to ask about one of their services finding the right number to call is important. This guide covers how to get in touch with Dulles Airport, why you should do so, and the different numbers you can need.