(WASHINGTON, D.C. AREA) — U.S. Transportation Secretary Sean Duffy announced on May 12, 2026 that the federal government plans a $22 billion rebuilding of Washington Dulles International Airport, with construction targeted for completion by 2034.

The proposal lays out a full-scale revitalization of the airport, from the main terminal to new concourses and underground connections. It also aims to retire one of Dulles’ most recognizable features, the mobile lounges, by extending the AeroTrain system so all terminals are served through underground and above-ground links.

Duffy’s announcement put a price and timetable on a project that would remake the airport’s core passenger areas over the next eight years. The budget figures include inflation and future interest payments, and the financing plan relies largely on borrowing rather than direct federal appropriations.

At the center of the plan is a $6.2 billion expansion of the main terminal, the Eero Saarinen-designed building that opened in 1962. Federal planners would preserve and renovate that structure, extend it by 300-foot to the east and west, renovate ticket counters, and add a new terminal concourse with an above-ground connector to a renovated Concourse A.

Work on the main terminal is targeted to begin in April 2027 and finish in December 2034. That makes it one of the longest-running elements in the broader overhaul.

A separate $2.26 billion project would replace the existing Concourse C/D with a new Concourse B. Plans call for 33 gates for United Airlines’ regional flights, with construction able to begin in January 2028.

The airport would also get a new Concourse D for non-United domestic flights under a project priced at $3.7 billion. Construction on the east gates is scheduled to start in June 2027.

Another large share of the spending, $3.75 billion, would go to the AeroTrain and a network of underground links. The plan extends the underground train from Concourse A to the new Concourse D and adds a new subterranean central spine connecting all terminals.

That work could begin in January 2028, with completion targeted for December 2033. By tying all terminals into the rail system, the project would allow Dulles to eliminate the mobile lounges that have long moved passengers across the airfield.

The financing plan assigns $21.8 billion to new bonds and $1.1 billion to airport fees. Those figures, as presented in the proposal, account for inflation and future interest payments.

That funding structure matters inside the airport’s governance system because the proposal still needs formal approval. The plan had been shared with airlines by early May 2026, but it requires official signoff from both the Metropolitan Washington Airports Authority and the Department of Transportation.

The administrative arrangement at Dulles gives each side a defined role. The Department of Transportation owns the airport property, while the Metropolitan Washington Airports Authority operates it under a long-term lease through 2100.

The proposal also follows an earlier planning step taken by the airport authority. On July 16, 2025, the MWAA board approved an updated Dulles master plan that outlined $7 billion in capital improvements through the end of the century.

That earlier master plan was far smaller than the rebuilding package Duffy announced Tuesday, and it did not settle the approvals now required for the federal proposal. Any implementation of the current plan requires approval from United Airlines unless Congress provides full federal funding for the project.

United’s position carries weight because the airline would occupy the new Concourse B built to replace the current Concourse C/D. The proposal assigns that future facility to regional flying, with 33 gates specifically designated for United Airlines’ regional operations.

The sequencing laid out in the plan would put several large projects under construction at roughly the same time. Main terminal work is set for April 2027, east-gate work on the new Concourse D for June 2027, and both the new Concourse B and the AeroTrain extension for possible starts in January 2028.

Those dates show how much of the overhaul depends on approvals arriving in time for design, demolition and financing to stay aligned. The new underground spine, the concourse replacements and the main terminal expansion are presented not as isolated upgrades but as pieces of one integrated rebuild.

Dulles has long been defined by Saarinen’s sweeping terminal and by the mobile lounges that carry passengers between aircraft areas and the main building. Under the federal plan, the terminal remains, but much of the airport around it would be rebuilt, connected below ground and reorganized around permanent concourses and train service.

The federal government framed the effort as a comprehensive revitalization rather than a single-terminal project. If approved, the plan would preserve the airport’s best-known architecture while replacing older concourse infrastructure, extending rail access across the field and setting a construction horizon that runs through December 2034.