No casualty was reported in the blaze caused by a short circuit that was doused by 4.20 pm.
"The fire started at a ground floor conference hall and spread to the first floor of a lounge near the airport's gate number 9," an official said.
An official of the Brihanmumbai Municipal Corporation (BMC)'s Disaster Control Room said the blaze started in the afternoon and fire brigade personnel rushed to the site along with eight fire engines, six jetties and water jets.
"The fire did not hamper flight operations. Nobody was harmed in the incident," they added.
Get the latest election news, live updates and election schedule for Lok Sabha Elections 2019 on ndtv.com/elections. Like us on Facebook or follow us on Twitter and Instagram for updates from each of the 543 parliamentary seats for the 2019 Indian general elections.