Washington Dulles International Airport Code, Map and Information

Opened in 1962, Dulles serves more than 21 million passengers a year for the Washington-Baltimore area (it’s one of three main airports for the region). While it handles fewer passengers than Baltimore-Washington International Airport or Ronald Reagan Washington National, it carries nearly all the international passengers entering the region.  

Airport Code

Washington Dulles International Airport : IAD

Fun Fact: Originally, the airport code for Dulles International Airpot was going to be the rather obvious, DIA. However, passengers and aviation crew alike would often read it as DCA, which happens to be the Ronald Reagan Washington National Airport’s code. So, they were forced to switch it to IAD to prevent confusion.

Airport Map

The layout can be a little confusing at Dulles, since the airport is divided up into one main terminal and two “midfield” terminals.

The main terminal houses all ticketing, baggage claim, and U.S. Customs. The only gates at the main terminal are the Z Gates (Air Canada Express and Frontier) and the H Gates. 

The two midfield terminals are where you’ll locate all the main Concourses and the majority of all gates.

The first terminal contains Concourse A & B and where you’ll find nearly all the non-United Airlines flights. If you are flying American Airlines or any international carrier, this is where you’ll gate will most likely be. 

The second terminal is used only for United Airlines and contains Concourse C & D. 

The official Dulles International Airport website has a high-resolution map you can view and download here


If you are looking for the most up-to-date departure information, use the official airport page here.


The best source of arrival information is the official airport arrivals page here.

Airport Parking

There are plenty of ways to park at Dulles. These include hourly, daily and long-term parking. 

  • The official airport lots and their real-time spot availability are located here
  • You can search for, sort, and pre-pay for your parking via SpotHero
  • Hop over to Google Maps to see all the options.