CANBERRA, Australia--Australian authorities believe Malaysia Airlines Flight 370 turned south earlier than previously thought based on an attempted phone call to the plane after it vanished, providing a new clue to the jetliner's possible location in the southern Indian Ocean.

Australia's Deputy Prime Minister Warren Truss said Thursday that the new assessment was based on fresh analysis that included being able to trace the satellite phone call by Malaysia Airlines ground staff, which wasn't successful in contacting the plane after it disappeared on March 8.

"The detailed research that is being done now has been able to identify, or trace, that phone call and help to position the aircraft and the direction it was traveling," Mr. Truss said.

Australia recently selected the Dutch oil-and-gas consulting firm Fugro NV to lead a rebooted search for Flight 370 in the Indian Ocean. The search effort in an area spanning 20,000 square miles could take up to a year, following its restart next month.

Mr. Truss said the new analysis won't lead to a shift in the search area. "But some of the information we now have suggests that areas a little further to the south within the search area may be of particular interest," he said in Canberra after meeting with Malaysian Transport Minister Liow Tiong Lai and Chinese Transport Minister He Jianzhong.

Flight 370 had 239 people on board when it disappeared en route to Beijing from Kuala Lumpur. Most of the passengers on board were Chinese citizens.

Searchers have so far surveyed more than 87,000 square kilometers of undersea topography ahead of a renewed hunt for the plane expected to cost more than 52 Australian million dollars (US$49 million). The search will straddle an arc drawn from a final ping transmission between Flight 370 and an Inmarsat PLC telecommunications satellite.

-Write to Rob Taylor at rob.taylor@wsj.com

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