Season 1 of On the Case with Paula Zahn premiered on October 18, 2009.

Season 2 of On the Case with Paula Zahn premiered on April 18, 2010.

Season 3 of On the Case with Paula Zahn premiered on November 7, 2010.

Season 4 of On the Case with Paula Zahn premiered on April 17, 2011.

Season 5 of On the Case with Paula Zahn premiered on October 30, 2011.

Season 6 of On the Case with Paula Zahn premiered on June 3, 2012.

Season 7 of On the Case with Paula Zahn premiered on December 16, 2012.

Season 8 of On the Case with Paula Zahn premiered on June 23, 2013.

Season 9 of On the Case with Paula Zahn premiered on December 22, 2013.

Season 10 of On the Case with Paula Zahn premiered on August 3, 2014.

Season 11 of On the Case with Paula Zahn premiered on February 22, 2015.

Season 12 of On the Case with Paula Zahn premiered on August 30, 2015.

Season 13 of On the Case with Paula Zahn premiered on March 6, 2016.

Season 14 of On the Case with Paula Zahn premiered on August 28, 2016.

Season 15 of On the Case with Paula Zahn premiered on May 28, 2017.

Season 16 of On the Case with Paula Zahn premiered on October 29, 2017.

Season 17 of On the Case with Paula Zahn premiered on July 15, 2018.

Season 18 of On the Case with Paula Zahn premiered on February 24, 2019.

Season 19 of On the Case with Paula Zahn premiered on November 3, 2019.

Season 20 of On the Case with Paula Zahn premiered on April 26, 2020.

Season 21 of On the Case with Paula Zahn premiered on November 29, 2020.

Season 22 of On the Case with Paula Zahn premiered on April 4, 2021.

Season 23 of On the Case with Paula Zahn premiered on August 8, 2021.

Season 24 of On the Case with Paula Zahn premiered on February 20, 2022.

Season 25 of On the Case with Paula Zahn premiered on September 4, 2022.

Season 26 of On the Case with Paula Zahn premiered on May 3, 2023.

Season 27 of On the Case with Paula Zahn premiered on March 6, 2024.