The incident was reported yesterday after a staffer at the airport informed CISF officials that his mobile, which he kept at a port for charging, was missing from near a boarding gate in the terminal area.
Officials said Central Industrial Security Force personnel immediately went through the CCTV footage and saw a person, identified as A Nathan, allegedly picking the phone.
They said the flier, travelling to Bengaluru, was soon intercepted and offloaded from the flight and handed over to Delhi Police which arrested him.