Season 1 of On the Case with Paula Zahn premiered on 2009-10-18.

Season 2 of On the Case with Paula Zahn premiered on 2010-04-18.

Season 3

8.3

.

2010

.

13 Episodes

Season 3 of On the Case with Paula Zahn premiered on 2010-11-07.

Season 4

8

.

2011

.

13 Episodes

Season 4 of On the Case with Paula Zahn premiered on 2011-04-17.

Season 5 of On the Case with Paula Zahn premiered on 2011-10-30.

Season 6 of On the Case with Paula Zahn premiered on 2012-06-03.

Season 7

8

.

2012

.

14 Episodes

Season 7 of On the Case with Paula Zahn premiered on 2012-12-16.

Season 8

8.1

.

2013

.

16 Episodes

Season 8 of On the Case with Paula Zahn premiered on 2013-06-23.

Season 9

8

.

2013

.

16 Episodes

Season 9 of On the Case with Paula Zahn premiered on 2013-12-22.

Season 10 of On the Case with Paula Zahn premiered on 2014-08-03.

Season 11 of On the Case with Paula Zahn premiered on 2015-02-22.

Season 12 of On the Case with Paula Zahn premiered on 2015-08-30.

Season 13 of On the Case with Paula Zahn premiered on 2016-03-06.

Season 14 of On the Case with Paula Zahn premiered on 2016-08-28.

Season 15 of On the Case with Paula Zahn premiered on 2017-05-28.

Season 16 of On the Case with Paula Zahn premiered on 2017-10-29.

Season 17 of On the Case with Paula Zahn premiered on 2018-07-15.

Season 18 of On the Case with Paula Zahn premiered on 2019-02-24.

Season 19 of On the Case with Paula Zahn premiered on 2019-11-03.

Season 20 of On the Case with Paula Zahn premiered on 2020-04-26.

Season 21 of On the Case with Paula Zahn premiered on 2020-11-29.

Season 22 of On the Case with Paula Zahn premiered on 2021-04-04.

Season 23 of On the Case with Paula Zahn premiered on 2021-08-08.

Season 24 of On the Case with Paula Zahn premiered on 2022-02-20.

Season 25 of On the Case with Paula Zahn premiered on 2022-09-04.

Season 26 of On the Case with Paula Zahn premiered on 2023-05-03.

Season 27 of On the Case with Paula Zahn premiered on 2024-03-06.

Season 28 of On the Case with Paula Zahn premiered on 2025-07-09.