Flight 9W 339, with 115 passengers and seven crew members, landed without incident at Ahmedabad and all 122 safely "deplaned", a Jet Airways spokesperson said.
The flight had taken off from Mumbai at 2.55 am and landed at Ahmedabad airport around 3.45 am.
The flight was "diverted to Ahmedabad following declaration of an emergency as per established security procedures, due to the detection of an onboard security threat", the spokesperson said.
A member of the cabin crew had found a "printed note" stating that there was a bomb in the belly, the cargo area, of the plane, a senior official of the Bureau of Civil Aviation Security (BCAS) told PTI.
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PTI correspondent Rajkumar Leishemba, who was on board, said the flight was diverted to Ahmedabad citing "security reasons".
All the passengers deplaned and screened. They were photographed and questioned by security personnel on various details, including their last overseas visit, he said.
After more than six hours at the airport here, the flight carrying the passengers took off for Delhi around 10.30 am, he said.
The B 737-900 aircraft was parked at a remote bay, the spokesperson said in a statement.
"Jet Airways is extending full cooperation to the security agencies who are investigating the matter and is not in a position to comment further at this stage," it added.
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