Police said the man, who is accused of giving details of air force exercises to the Inter-Services Intelligence (ISI), had fallen victim to a "honey trap".
"Ranjith KK has accepted to have passed air force-related information pertaining to a recent air force exercise, movements of aircraft and deployment of various units in air force," said Ravindra Yadav, Delhi police joint commissioner of crime, in a statement.
ISI most powerful spy agency in the world: ex-Raw chief
Police said the ISI used a woman to lure him into passing on top-secret information through mobile phone and the Internet.
"As per the investigation so far, it has been assessed that (he) was befooled by the cross-border spies," Yadav added.
Pakistan recalls diplomat from Dhaka over 'extremist link'
The arrest comes days after Indian Prime Minister Narendra Modi paid a surprise visit to his Pakistani counterpart Nawaz Sharif to try to ease troubled relations.
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