June 17 (Reuters) - U.S. stock indexes opened flat to lower, with the benchmark S&P 500 retreating from record highs as investors awaited fresh economic data and comments from Federal Reserve officials throughout the week for more clarity on monetary policy.

The Dow Jones Industrial Average fell 23.98 points, or 0.06%, at the open to 38,565.18.

The S&P 500 opened lower by 0.49 points, or 0.01%, at 5,431.11, while the Nasdaq Composite gained 8.42 points, or 0.05%, to 17,697.30 at the opening bell. (Reporting by Lisa Mattackal in Bengaluru; Editing by Devika Syamnath)