Officials said the incident was reported at about 4:00 AM when on-duty CISF personnel apprehended a man, identified as A V Singh, while he was hurriedly exiting from the terminal.
On being probed, they said, Singh was detected to have entered the airport terminal using an invalid ticket which he had booked but cancelled later.
Singh informed, they said, that he did this act in order to see off his girlfriend who was travelling to Bangkok via Kolkata.
Under the law, only fliers with a valid travel ticket can enter the airport terminal area.