Main terminal
Holds ticketing, check-in, the security checkpoints, baggage claim and the ground transportation level. The Silver Line Metro station is connected by a tunnel.
Washington Dulles International Airport (IAD) terminal guide
Dulles, Virginia KIAD #22 US airport by passengers
How IAD is laid out and how to move between buildings.
Terminals at IAD
Concourses A and B
Reached by a walkway or the AeroTrain. A and B hold many airline gates and the Chase Sapphire and British Airways lounges.
Concourse C
Reached by the AeroTrain. This is where the United Polaris Lounge is located, and many United gates are here.
Concourse D
Reached by a shuttle bus from the main terminal, or on foot from Concourse C. It is used by many international flights.
Concourse Z
Reached by walkway from the main terminal. Concourse Z has a small number of gates.
Moving between terminals
The AeroTrain connects the main terminal to Concourses A, B and C, and each trip takes about two minutes. Concourse D is served by a shuttle bus from the main terminal, and Concourses C and D connect on foot. These transfers all happen inside security, so you do not need to be screened again. Concourse E is due to open in late 2026.
Reviewed October 9, 2026. Confirm details on the official airport website. Spotted a change?
Frequently asked questions
Can I walk between Dulles concourses after security?
Yes. The AeroTrain links the main terminal to Concourses A, B and C, and the concourses link to each other by walkway or shuttle. None of these transfers require a new security check.