Imran Khan, like many of his countrymen and party members, is not an admirer of the US.
Since your question is exclusively about Imran Khan's views, not that of his party leaders, I will stick to those.
Imran Khan understands the value of the US-Pakistan relationship but he wants to change the dynamics of it where they would work more in the favor of Pakistani state instead of the US. At the same time, he absolutely disagrees with the US policies of the past in War on Terrorism and those concerning Pakistan exclusively.
Last month, he said that improving US-Pakistan relations is important but he also criticised Donald Trump for claiming that Pakistan is responsible for US failure in Afghanistan.
Same month, he gave an interview to the BBC where he was asked about his views on US Pakistan relations, his reply was:
Let me make it clear, Pakistan has to be friends with America. US is a
super power. But where most of us felt deeply hurt is where Donald
Trump blamed Pakistan for the failure of United States in Afghanistan.
We felt that here was a country that was being made a scapegoat, a
country that had 70,000 people killed fighting a US War. We had a 100
billion USD lost to the economy because General Musharraf took us into
a war that was not our war. I opposed it. And at the end, the
humiliation, I mean to be made a scapegoat for their failure in
Afghanistan.
When Zainab Badawi, BBC host, asked him directly if he was Anti-American, he replied with a Question of his own.
"I criticize Pakistani Government and her policies. Does that make me anti-Pakistan?"
Almost two weeks ago he said:
Pakistan Tehreek-i-Insaf (PTI) chairman Imran Khan has said that his
party is not against any country, but is against the US policy in the
war on terror. “PTI does not want to have bad relations with any
country.”
Speaking to the media at Karachi airport on Wednesday, the party chief
said that he had been against the US’ war on terror since day one and
is still against it. “If we want to win this war against terrorism,
then we should come out of the US war.”
He said the PTI is neither “pro nor against the US. It takes a
position based on its policies. Thus, PTI has consistently opposed
American war in Afghanistan and Pakistan’s partnership in it. Events
have proved the party stand to be correct.”
Just six days ago, he gave another interview where he claimed that US used Pakistan and the relations have always been one-sided.
Chairman Pakistan Tehreek-e-Insaf (PTI) Imran Khan said on Friday that
the United States of America used Pakistan as a triggerman and the
bilateral relations have remained always one-sided.
The same week he said:
Pakistan could not carry on by severing ties with the United States.
Just one our ago, he was live on National Media to outline his domestic and foreign policies as unofficial Prime Minister Elect. He again reiterated his position that he wants to end the unilateral relations between the two countries and instead promote a mutually beneficial working relationship with special emphasis to Afghanistan and Middle East. Most importantly, he was very much pro-China in his speech, in contrast to the US.
Bear in mind however, many influential leaders of his party are very much anti-US. Some like Shirin Mazari have even proclaimed that any Pakistani who likes the US is a traitor.
The mistrust is not one-sided. DW asked the US State Department if they would work with Mr. Khan in case he becomes the PM, American reply was diplomatic:
"The US government supports a free and fair vote by the Pakistani
people, and stands ready to partner with the leadership they choose to
work on a shared agenda for regional peace and prosperity,"
Experts of South Asian affairs at Woodrow Wilson Centre for Scholars were more explicit in their analysis:
"For the US, the idea of a Prime Minister Imran Khan may be
unsettling, given how he and his party have been stridently
anti-American in tone and messaging in ways that the PML-N (Pakistan
Muslim League of former PM Nawaz Sharif) have not been," Michael
Kugelman, an expert of South Asian affairs at the Woodrow Wilson
Center for Scholars in Washington, told DW.
So in conclusion:
- Imran Khan is neutral regarding the US.
- He wants to redefine the dynamics of the relationship between the two nations.
- He wants to get out of the American-led War on Terror and fight/negotiate alone.
- He doesn't want to make an enemy out of the US nor is he essentially against the Americans.
- He is decisively pro-China which might cause troubles with the US even if it is not his intent. He is also pro-Iran but like all his predecessors, he likes to keep a balance between Iran and KSA.