NEW YORK -- The rebuilding of the World Trade Center, destroyed in the Sept. 11, 2001, attacks, won't be completed until the middle of the next decade, and will cost as much as $3 billion more than planned, according to people familiar with the matter.

The Port Authority of New York and New Jersey, which owns the 16-acre site in Lower Manhattan, is expected to release a report Monday detailing significant delays and cost overruns on construction there.

The...