The wheat, with 12.5 percent protein content, is for shipment during June to August, GSFMO acting director general Abdulrahman Al Ruwaitie said in a statement.
The accepted origins are the European Union, North America, South America and Australia, at the sellers' option, the GSFMO said.
The purchase comprises 13 consignments, with a total of 540,000 tonnes in nine vessels to be shipped to the port of Jeddah and 240,000 tonnes in four vessels to Dammam, he said.