The US State Department notified Congress of its approval for the possible sale of Advanced Anti-Radiation Guided Missiles Extended Range (AARGM-ER) to Australia on Friday.
It comes after the federal government asked to buy up to 100 of the missiles, among other gadgets, at an estimated cost of $US405 million ($A586 million).
The advanced anti-radiation missiles would be integrated into fighter jets, allowing pilots to eliminate land or sea-to-air missiles and improve the survivability of tactical aircraft.
Increasing the air force's war stock inventory with guided missiles would enhance the nation's defence capability, a Department of Defence spokesman said on Saturday.
"As outlined in the 2024 National Defence Strategy, Defence must rapidly increase war stock inventory levels to meet preparedness assurance requirements," he said.
The proposed sale would support US foreign policy and national security objectives by aiding an important ally in the Pacific region, the Pentagon said in a media statement.
"The strategic location of this political and economic power contributes significantly to ensuring peace and economic stability in the western Pacific," it said.
The principal contractor will be Northrop Grumman, the Pentagon said.
The latest approval comes after the  Australian government requested to buy up to 63 of the same missiles and other defence equipment for $US506 million ($A732 million) in February 2023.
