"The deal for Apache and Chinook (helicopters) has been cleared," government sources said.
The CCS met after a Cabinet meeting, they said.
Many in the defence sector had expected the deal, valued to be over USD 2.5 billion and pending since 2013 following finalisation of cost negotiations, to be signed during the visit of US Defence Secretary Ashton Carter in June this year.
The US has been pushing for this contract as it will further bolster American presence in the burgeoning defence market of India.
American companies have over the last decade bagged defence contracts from India worth around USD 10 billion, including for aircraft like P-8I maritime surveillance planes, C-130J 'Super Hercules' and C-17 Globemaster-III in the transport category.
The Prime Minister will leave for the US tomorrow to attend the UN General Assembly.
The contract will have clauses to place follow-on orders for 11 more Apaches and seven rpt seven extra Chinooks.
Both platforms, which have been in combat in Afghanistan and Iraq, had beaten off competition from Russia, which had offered its Mi-28N Night Hunter and Mi-26 heavy-lift copters.
The 22 Apache AH 64D Longbow helicopters are one of the most advanced multi-role combat helicopters, featuring all-weather and night fighting features, ability to track upto 128 targets in less than a minute and engage with 16, besides stealth characteristics, advanced sensors and beyond visual range missiles.