If you’re wondering What Terminal is Avianca Airlines at IAD?, Avianca Airlines operates out of Terminal B of Washington Dulles International Airport. Terminal B offers travelers a quick check-in process, friendly Avianca staff, and a well-organized structure for simple transit. Passengers can enjoy a variety of amenities, including comfortable seating areas, dining options, shopping, and lounge access. The efficient design ensures seamless transitions from ticket office to gate, providing a relaxing and dependable start to your journey. Avianca stresses pleasant service and convenience for passengers departing from IAD.