From Bentota taxi to Diyawanna Oya airport then fly to Colombo airport. 1 h 11 min $154. From Aluthgama train to Colombo Fort, walk to Colombo Bastian Mawatha Bus Terminal, then line 187 bus to Katunayake Airport Bus Station. 2 h 44 min $2. From Bentota taxi to Colombo Airport (CMB). 1 h 24 min $63. From Bentota drive to Colombo Airport (CMB). 1 h 24 min $9.