The electoral body also ordered the Pakistan Tehreek-e-Insaf chairman to submit surety bonds of Rs 100,000 till September 25 to avoid arrest, the News International reported.
Hearing the contempt of court case against Mr Khan filed by PTI dissident and one of the founding members, Akbar S Babar, the poll panel ordered the cricketer-turned-politician to appear before the court on September 25.
The ECP had issued the contempt notice to Mr Khan on January 24 over his "scandalous remarks" about the commission. He also accused the body of being biased in a foreign funding case.
Mr Khan's counsel Babar Awan argued on Thursday that the PTI chief was abroad and had returned to the country just an hour ago.
"Imran Khan respects the Election Commission and will appear before the ECP whenever it orders," Dawn quoted Awan as saying.
The ECP, which reserved its judgment in the contempt case, had last month issued a second showcause notice to the PTI chief after he failed to reply to the earlier notice regarding the contempt of court proceedings against him.
Raising objections over the ECP's jurisdiction to initiate contempt proceedings against him, the PTI chief had initially challenged the maintainability of the contempt petition.
The ECP, however, declared on August 10 that it had the legal right to hear the contempt case and had then issued a formal showcause notice to the PTI chairman, asking him to submit a reply by August 23.