Kerry had accepted an invitation to visit Pakistan, extended to him by Sartaj Aziz, advisor on national security and foreign affairs to the Pakistani prime minister, on the sidelines of the 20th Ministerial Meeting of the ASEAN Regional Forum July 2.
The US Secretary of State was previously expected to arrive in Pakistan on July 29.
However, the trip was later postponed after US officials said that he would visit Pakistan in "a few days time".
The US authorities believed that the revelation of possible dates of Kerry's visit might compromise his security and they postponed the trip, diplomatic sources said.
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Sources said Secretary Kerry is expected to arrive in Pakistan on July 31 as the condition of his wife, who has suffered a stroke earlier this month, was improving.
According to the new itinerary, Kerry would hold meetings with the Pakistan President, Prime Minister, and the Advisor for national security and foreign affairs on August 1.
Key issues including drone attacks in Pakistan are expected to be discussed during the US official's visit.
Kerry will be the first high-level US official to tour Pakistan since new government took office after historic May 11 elections.