Coverage of the event at New York City's Lincoln Center will begin at 10:30 a.m. The service will be Webcast on CBSNews.com, CBS.com, TV.com and ustream.com.
President Obama and former President Clinton will offer tributes to the legendary CBS News anchor who died in July at the age of 92.
Also slated to speak are CBS President Leslie Moonves, former network president and Cronkite colleague Howard Stringer and astronaut Buzz Aldrin, whose moon landing was famously covered by the broadcast journalist.
Mickey Hart, Jimmy Buffett, and Wynton Marsalis are among the musicians who are scheduled to perform at the service, which will run about two hours.