He characterized his campaign as a battle against political elites - dominated by long-established parties like the PML-N and PPP - that he accuses of hindering economic development in the impoverished country of 208 million.
Supporters of jailed ex-premier Nawaz Sharifsaid there were problems with the vote count and the process was an assault on democracy in a country that has a history of military rule.
But if his party is delayed in forming a government, it could further damage the country's economy which has a looming currency crisis and is expected to force the government to turn to the International Monetary Fund for a bailout.
Jubilant Khan supporters danced to the beat of drums at his party headquarters in Islamabad, sensing a victory.
Election researcher Azeema Cheema said the contest remained "too competitive to call", with the most populous province of Punjab likely to be the key following fierce campaigning in battleground areas there.
Sharif, the younger brother of disgraced ex-prime minister Nawaz Sharif, took over the ruling Pakistan Muslim League previous year after his brother was found guilty of corruption. A single party will need at least 137 of the directly elected seats to be able to form the government on its own.
Khan, however, is wary of governing with the established parties.
PTI leads in Pak election 2018 results
His PTI party is still expected to fall short of an overall majority and to seek coalition partners. "Twenty-two parties said the election was rigged and I was the only one who said there should be an investigation", he added.
The polls were guarded by police, troops and paramilitary rangers, after several attacks during the campaign killed more than 200 people. On the other hand, Mumbai attack mastermind and Jamaat-ud Dawa (JuD) chief Hafiz Saeed seems to have been rejected by Pakistani voters as none of the candidates associated with extremism in past have leads.
Khan has also increasingly catered to hardline religious groups, particularly over the inflammatory issue of blasphemy, sparking fears a win for PTI could embolden Islamist extremists. A further 70 seats for women and minorities are awarded proportionally based on the voting percentages.
However, PML-N leaders pulled no punches.
Khan also said that he was very disappointed with the Indian media which had projected him like a "Bollywood villain" in recent weeks.
Thousands vying for office: More than 11,000 candidates were in the running for the 272 seats in Pakistan's National Assembly and the 577 seats in four provincial assemblies. Its spokesman, Nadeem Qasim, said Khan had violated constitutional provisions on "the secrecy of the ballot" and that his vote could be disqualified.
Mushahid Hussain Sayed, a PML-N senator, said the party had delivered on promises to reduce electricity shortages and improve infrastructure. He also said he will not live in the Prime Minister's house but a simple, non-extravagant residence.
"It's two planks", Sayed said of the PML-N's appeal to voters. Sharif has clashed repeatedly with the military over the years and was jailed this month on corruption charges, which he is appealing. The ECP rejected the "blatant" rigging allegations.
The two would work for zero tariffs, zero non-tariff barriers, and zero subsidies on non-auto goods, he said . After their meeting, Mr Juncker thanked the US President and claimed it was a "good, constructive meeting".
Sixty-one percent of the survey's respondents said strengthening U.S. -Russia relations is in the nation's best interests. Mr Trump then told CBS he held Mr Putin personally responsible for Moscow's meddling in the 2016 United States elections.
The prime minister-designate of Pakistan's Muslim League party pledges to emulate Mahathir in developing Pakistan. A third candidate, Bilawal Bhutto Zadari, from the Pakistan People's Party, could be the kingmaker.
The shares rose as much as 5.3 per cent, the most in nearly nine months, to US$1,275 at the market open in New York Tuesday. Also delighting Wall Street, Alphabet has apparently lowered the expenses in the non-Google businesses in its portfolio.
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Either a country which has treated the United States unfairly on Trade negotiates a fair deal, or it gets hit with Tariffs. The U.S. has also imposed tariffs on $34 billion in Chinese products and threatened tariffs on $500 billion more in goods.
Fourteen people, including a young girl, were shot in the incident near downtown Toronto, police in Canada's biggest city said. The 13 wounded ranged in age from 10 to 59, and suffered injuries ranging from serious to minor, Saunders said.
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