Washington Dulles International Airport is set for a decade‑long overhaul worth more than $20 billion, in what officials describe as a historic redesign of the capital’s primary global gateway.

The project – developed by the Metropolitan Washington Airports Authority, United Airlines and the U.S. Department of Transportation will add or renovate more than five million square feet of airport infrastructure.

Plans include new and modernised concourses, expanded boarding and ticketing areas, and a reconfigured Main Terminal offering walkable access to international gates and a new U.S. Customs facility. A major shift will see the AeroTrain system extended to replace the airport’s long‑criticised mobile lounge vehicles.

Airports Authority CEO Jack Potter said the construction builds on the multiyear Dulles Master Plan and will modernise Washington’s main international airport for future growth . United CEO Scott Kirby added that the investment will deliver a “world‑class airport experience” and strengthen the airline’s Dulles hub.

The upgrade will also introduce improved security screening, enhanced baggage systems, additional gates, expanded United Club spaces and one of the world’s largest United Polaris lounges.

The Airports Authority will finance much of the programme through municipal bonds, significantly increasing the scale of the original $7 billion modernisation plan. Construction will be phased to keep the airport operating throughout, with the first major milestone – the opening of Concourse E with 14 new United gates – expected later this year.

Virginia Governor Abigail Spanberger said the project will bring new jobs and investment to the region while ensuring Dulles remains a world‑class international gateway for generations to come.