He will leave for the US on September 25, instead of September 26.
PM Modi will meet President Barack Obama at the White House on September 29 and 30. He is also scheduled attend the UN General Assembly session in New York.
Upon arrival, his first engagement will be to visit the 9/11 memorial site early on September 27.
Sources said the PM would land in New York on the afternoon of September 26, around 5 hours ahead of the schedule.
His plane, the Air India One, will take a halt in Germany's Frankfurt. Night flights, between 11 pm and 5 am, have been banned in Frankfurt following complaints by local residents about the noise.