The Delta Airlines  IAD Terminal uses Terminal B at Washington Dulles International Airport (IAD). This terminal offers a range of facilities, such as lounges, restaurants, and retail stores. In Terminal B, check-in desks and departure gates are easily identifiable for Delta flights. Arriving early will help passengers finish check-in, get through security, and take advantage of the terminal's amenities. Check out the airport's website or app for the most recent flight updates and gate information.