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Mr Pompeo had said a Pentagon team would meet with the North's officials on or around Thursday at the inter-Korea border to discuss the repatriation.
North Korean leader Kim Jong Un has sent a letter to President Donald Trump praising progress in relations between the two countries and bringing up the possibility of another meeting between the two state heads.
North Korea watchers downplayed the significance of the letter.
"A very nice note from Chairman Kim of North Korea", Mr Trump tweeted alongside a copy of the letter.
US President Donald Trump met North Korean leader Kim Jong Un on Sentosa Island last month.
This latest incident comes shortly after Pompeo's visit to Pyongyang resulted in North Korea accusing Pompeo of making a "unilateral and gangster-like demand for nuclearization".
Trump was in London to meet with United Kingdom leaders after leaving the North Atlantic Treaty Organisation summit in Brussels, Belgium, when he tweeted Kim's letter.
An estimated 30,000 U.S. soldiers died in the 1950-53 Korean war.
Earlier Thursday the North Koreans postponed a meeting with USA representatives at the inter-Korean border meant to discuss the repatriation of remains of American troops killed in the Korean War.
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"We will be ready", Mr Nauert said.
It wasn't immediately clear what prompted the postponement.
Mr. Trump repeatedly touted that he shared a positive relationship with Mr. Kim, despite North Korean officials criticizing the U.S.in recent weeks. Pyongyang has asked the UN Command Armistice Commission to upgrade the talks to a higher level to include a United States general, South Korea's foreign ministry said.
The Americans called North Korean representatives and scheduled a generals' meeting between the two nations to take place Sunday.
But Pompeo gave a rosier account saying the two sides had substantive discussions on next steps toward denuclearisation.
He also says that bilateral trust should be "further strengthened in the future process of taking practical actions".
But there's growing skepticism in Washington over the Trump administration's engagement with North Korea.
Pompeo dismissed the statement, while Trump suggested it was written under pressure from China.
Earlier Thursday, after attending the NATO summit in Brussels, he told reporters that there were clear signs of progress with North Korea, most notably that no missile and nuclear tests have occurred for nearly nine months.