He, however, escaped unhurt while four people were killed and 14 others injured in attack.
A string of violent attacks at political rallies, killing almost 160 people this week, has the nation on edge about security for the upcoming national elections, with some political leaders blaming the Pakistani government for not doing enough to protect the electoral process. Among those killed was provincial assembly candidate Nawabzada Siraj Raisani.
The first bomb that killed four people exploded in northwest Pakistan near the election rally of a senior politician from an Islamist party who is running for parliament from the northwestern town of Bannu.
Balochistan province's home minister Agha Umar Bungalzai said the death toll in the town of Mastung "has risen to 128".
Image The injured are taken to hospital after a suicide bomber hits Baluchistan
No group has so far claimed responsibility for that attack.
The Supreme Court a year ago disqualified Sharif from holding public office for being corrupt and dishonest about his wealthy family's overseas assets as revealed by the leaked Panama Papers.
The PML-N announced on Sunday that the party would be suspending all election-related activities for the day "to mark the observance of the national day of mourning on the Mastung tragedy".
The injured included a candidate from Mastung, Siraj Raisani, a brother of the former Chief Minister Balochistan Nawab Aslam Raisani.
The second explosion was in southwestern Baluchistan province, that killed 65 people and critically wounded the candidate.
Earlier Friday, a group of Pakistani and global academics issued a statement condemning intimidation and harassment of Sharif's supporters, saying that the crackdown threatened the country's ability to hold free and fair elections. He later visited the injured in a hospital in Bannu and said that his vehicle was damaged in the attack.
Mohamed Zahid, an official at the airport, said officials from Pakistan's anti-graft body are present at the airport to arrest Sharif and his daughter who were convicted and sentenced in absentia to ten and seven years, respectively, in a corruption case. "We will continue to stand with the people of Pakistan and the broader South Asia region in their fight against terrorism".
Mr Durrani is running against popular former politician Imran Kan and is a candidate of Muttahida Majlis-e-Amal, an election alliance of radical religious groups.
After boarding the flight Friday, Sharif posted a video on social media urging supporters to show up in droves for the July 25 election, and thereby resist what he has called a conspiracy to oust his ruling party from power.
About 20 election workers with the secular Awami National Party were killed Tuesday in a suicide blast in the northwestern capital of Peshawar.
The attack may keep some investors skittish over Pakistan, despite rising foreign investment, spearheaded by China which is providing about $60 billion in funds and loans for infrastructure projects across the country.