Connecting at Dulles airport - Washington D.C.

Connection time calculator, immigration and security, and how to move between terminals at IAD.

How connections work at IAD

At Washington Dulles airport, as at every airport in the United States, passengers arriving on an international flight must clear immigration (CBP) and customs, collect their checked bags and re-check them, and go through TSA security again before their connecting flight, even when both flights are on the same ticket.

The airport has 4 terminals or concourses (Concourse A, Concourse B, Concourse C, Concourse D). All of them are connected after security, so you do not need to clear security again to change.

Connection time calculator

Is your layover at IAD long enough? Pick your connection and get an estimate with the times of this airport.

Terminals / concourses: Concourse A, Concourse B, Concourse C, Concourse D

Getting between them: AeroTrain (airside, about 2 minutes between stations); walkways between A and B and between C and D; mobile lounges for Concourse D

All concourses are connected after security: the AeroTrain links the main terminal with concourses A, B and C, A and B are linked on foot, and C and D are linked; mobile lounges serve Concourse D and some international arrivals.

Official transfer times:

  • Any AeroTrain station → Next station: up to 2 min by train

There is no internal airside passport control. Arriving international passengers clear U.S. Customs and Border Protection (CBP) on arrival.

  • Arriving international passengers must clear customs before they can use the AeroTrain to their next concourse.
  • Immigration is busiest between 13:30 and 18:30, mainly at Concourse C: allow extra time for international-to-domestic connections.
  • For separate tickets with an international arrival, allow at least 2.5 hours to clear customs, reclaim bags and check in again.

Estimate based on typical times at this airport, not your airline's official minimum connection time. Immigration and security lines change with the time of day and season. On a single ticket, the airline must rebook you if you miss the connection; on separate tickets, it does not.

Sources: travelextra.ie.

Times are estimates: always check with your airline.

TSA security wait times

Estimated wait at the security checkpoints of IAD right now. When live data is not available, it shows historical averages.

More about IAD

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