The flight 9W339, which took off from Mumbai at 0255 hours, landed at Ahmedabad airport at around 0345 hours.
A passenger onboard said the flight was diverted to Ahmedabad citing "security reasons". All the passengers were asked to deplane and were screened.
A security personnel at Ahmedabad airport said the flight was diverted as there was a specific threat call.
The number of passengers onboard could not be immediately ascertained. There was no immediate response from Jet Airways spokesperson.