The wreckage of missing Malaysia Airlines Flight MH370 may wash up on the Indonesia coastline, says authorities. 

The Australian Transport Safety Bureau (ATSB), which is leading the search for the aircraft off the coast of Perth, believe debris from the aircraft could be drifting towards Indonesia's coastline, reports Sydney Morning Herald. 

The flight, which disappeared in March with 239 people on board, still has not been found in the water where it was last seen. 

Search operations began in the Indian Ocean - focusing on a long, narrow arc to the south - where the plane was last picked up by satellite. 

The high-priority area, where investigators believe the plane ran out of fuel, is about 197,000 square-feet, reports Sydney Morning Herald. So far, only about 4,000 square-feet have been searched underwater. 

Now investigators believe the debris could have drifted further west - towards the Indonesian coast. 

"The ATSB reviews all of this correspondence carefully, but drift modelling undertaken by the Australian Maritime Safety Authority has suggested that if there were any floating debris, it is far more likely to have travelled west, away from the coastline of Australia," an operational update says.