Modi, who became the first Indian prime minister to attend the summit in two decades, delivered the opening plenary speech and met many world leaders and chief executives.
"After a historic and successful participation at @wef in #Davos, PM @narendramodi emplanes for flight back home at Zurich airport.#IndiaMeansBusiness," an external affairs ministry spokesperson said in a tweet.
In his plenary address, Modi talked about serious challenges and grave concerns facing the world, including terrorism.
The WEF has truly distinguished itself as a premier forum for deliberations on vital global issues, the prime minister said in a tweet.
Among the world leaders, he met his Canadian counterpart Justin Trudeau, Queen Maxima of the Netherlands and Swiss President Alain Berset.
More than 3,000 world leaders from business, politics, art, academia and civil society are attending the annual meet, where the Indian presence is the largest ever with over 130 participants.
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