Washington Dulles International Airport, named after John Foster Dulles. Airport Facilities Dulles Airport has 113 airline gates. Concourse A: 31 United Express Commuter gates + 12 mainline gates Concourse B: 32 mainline gates Concourse C: 22 United mainline gates Concourse D: 24 United mainline gates Concourse Z: 4 mainline gates Hard Stand Aircraft Locations: 16 "Remote Gate" positions on the South side of Dulles Terminal The Terminal was originally built as a compact two-level structure 600 feet long and 200 feet wide, from the design of world renowned architect Eero Saarinen. The October 1, 1996, expansion of the Terminal was a prominent milestone in the Capital Development Program. The Terminal was expanded from 600 feet in length and 500,000 square feet to 1,240 feet in length with a total of 1.1 million square feet all in accordance with Eero Saarinen’s original design. https://www.flydulles.com/iad/airport-overview
There are 135 gates and I think 5 terminals. It depends on the airline as to which you will use to ULN.
Thanks! Your answer is awaiting moderation.