"It is not necessarily routine for the president to greet the foreign leader at Andrews," White House spokesman Eric Schultz said as he announced the move.
Obama rarely even travels to the doors of the West Wing to great foreign dignitaries, so the short helicopter hop to rural Maryland is deeply symbolic, although not unprecedented.
The Obamas will follow in the footsteps of George W. Bush, who greeted Pope Benedict at Andrews in 2008.
Francis is popular in America and expected to draw huge crowds in the three cities he will visit.