"Working westward. PM @narendramodi departs on a 2 nation, 3 city visit to Ireland & the US, will address the @UN," tweeted external affairs ministry spokesperson Vikas Swarup.
Modi will spend Wednesday in Ireland where he will hold discussions with Prime Minister Enda Kenny. He will depart for New York the same evening for the US leg of his tour.
The prime minister will be in the US till September 29.