As soon as the flight landed, the flight crew along with the airport fire services examined the cargo hold area but no smoke was observed, IndiGo said.
All passengers are safe, it said.
IndiGo confirms that its flight 6E-516 flight operating on Cochin to Delhi route made a precautionary landing at Bangalore airport this morning at 0745 hours, the airline said in a statement.
While the aircraft was airborne, the flight commander noticed cargo hold smoke warning in the cockpit, it said adding keeping in mind the safety, the flight crew immediately discharged fire extinguisher which is as per the Standard operating procedures prescribed by the manufacturer.
After landing, all 173 passengers were deplaned at the Bangalore airport as per normal procedure, the statement added.
The incident is being probed both by the Directorate General of Civil Aviation DGCA and IndiGo's safety department, the airline said.