"We will... Push to sign the contract in the third quarter... After testing and further negotiations," Jung Kwang-Sun, the Defense Acquisition Program Administration's aircraft department director, told reporters in a briefing late yesterday.
The South's air force has been looking to upgrade its ageing fleet of Boeing F-4 and F-5 fighters in the light of North Korea's growing nuclear threat.
Jung did not specifically name the F-35s, but they are the only jet fighters on offer that meet the requirement -- laid down by the South Korean joint chiefs of staff last month -- for a stealth-capable fighter.
The Boeing aircraft was the only one to come in under the USD 7.7 billion budget approved by parliament.
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The tender has since been adjusted, although Jung declined to give details on the cost of the 40 F-35s, saying it would require both finance ministry and parliamentary approval.
"If we choose to buy F-35s, we will choose to buy the F-35A that has been adopted by the US Air Force," he said, adding they would be delivered from 2018 onwards.