Seoul has been in talks with the US defence firm on terms of the deal since March after Seoul picked the F-35A as its next-generation fighter jet.
"We held negotiations from March to September on technology, price and trade-off conditions", a spokesman of the Defense Acquisition Program Administration said.
"The purchase price per unit is around 120 billion won," he was quoted as saying by Yonhap news agency.
South Korea wants to start deploying the new combat planes from 2018, he said.
The South's air force has been looking to retire its ageing fleet of Boeing F-4 and F-5 fighters and replace them with new jets.
The absence of a stealth capability was behind the military's decision in September last year to block a USD 7.7 billion deal to buy 60 of Boeing's F-15 fighters.
The Boeing aircraft was the only one to come in under the USD 7.7 billion budget approved by parliament.
The tender has since been adjusted.
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