The Obamas departed Joint Base Andrews this morning at 8:20 a.m. EST to fly to South Africa for Tuesday's event.
They will be among a large gathering of world leaders. South Africa's Department of International Relations and Cooperation released a long list of current world leaders who will be attending.
President Obama will also be joined by former U.S. Presidents George W. Bush, Bill Clinton and Jimmy Carter and their wives, as well as 26 U.S. Congressional members at the four-hour memorial service tomorrow.
[South African Foreign Affairs Ministry]