The Irving, Texas, company reported a loss of $3.96 a share, compared with earnings of 81 cents in the year-earlier period.
Revenue was $4.09 billion, down 16% from $4.88 billion.
Analysts surveyed by FactSet were expecting the company to report earnings of 50 cents a share on revenue of $4.71 billion.
The stock was trading at $23.20 a share.
The latest earnings reflect pretax charges of $714 million stemming from a review of operations and "project developments," Fluor said. The results also reflect $46 million of restructuring charges.
"We understand the implications of the magnitude of these results," Fluor CEO Carlos Hernandez said in a statement.
"During the quarter, we commenced a comprehensive operational and strategic review of Fluor's businesses. These charges reflect our efforts over the past few months to meet with clients, subcontractors, suppliers and our project teams to evaluate and address the status of our current projects."
Corporate general and administrative expense in the quarter nearly tripled to $53 million from $18 million a year earlier.
Given the report and the review of operations, Fluor withdrew all earnings guidance for 2019.
Fluor's consolidated backlog at June 30 rose 21% to $35.5 billion from $29.3 billion.
Save 76% with our Summer Break Sale. Subscribe to our premium site Real Money and become a smarter investor! Click here today to sign up!