It is the second plane being sent after an earlier flight brought back about 500 people on the weekend.
The aircraft was earlier scheduled to leave today for Djibouti where about 200 Pakistanis are to be taken from Aden through a Chinese ship.
Foreign Office FO spokesperson Tasnim Aslam said in a statement that departure of the special aircraft was linked to the departure of Chinese vessel that reached Aden this morning.
"While all arrangements were in place and the Pakistani nationals awaiting evacuation had their immigration in time, the Yemeni authorities have allotted a time slot for embarkation to the Chinese ship only for tomorrow morning," she said.
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The Pakistani nationals have been asked to reach Aden from various places in Yemen.
Pakistan has instructed its ambassador in Ethiopia to personally set up a camp office in Djibouti to receive these Pakistanis, and organise their immigration, stay and return journey.
The Djibouti government also agreed to provide all required support. Pakistan also sent a naval ship to evacuate more Pakistanis from Aden. It is expected to dock in the open sea near Aden tomorrow.
According to officials the situation in Aden was precarious and small boats are used to carry the passengers from the port to the open sea and then boarded on the ships.
Prime Minister Nawaz Sharif has already ordered authorities to safely retrieve all Pakistanis from Yemen.