Ousted President Manuel Zelaya has left the US on a flight to Honduras to reclaim his post, BBC reported.
Mr Zelaya, who was removed from office by troops a week ago, says he is determined to return to his country.
But the interim government says it will not allow Mr Zelaya's plane to land. There are growing fears of violence in the Central American nation.
On Saturday, the capital's archbishop urged Mr Zelaya not to return, warning of a possible "bloodbath".
Mr Zelaya is being accompanied on the plane by UN General Assembly President Miguel D'Escoto Brockmann.
The presidents of Argentina, Ecuador and Paraguay and the head of the Organisation of American States (OAS) have said they will fly to neighbouring El Salvador to monitor events from there.
Meeting in Washington on Saturday, the OAS decided to suspend Honduras over the crisis.