| August 23, 1944: | Delta Delta is founded at the St. Louis University School of Dentistry. Not only is Delta Delta the 100th chartered chapter of Alpha Phi Omega, but is the only chapter founded during WWII and the only chapter to ever be founded at a professional school. |
| 1945: | Delta Delta loses membership, but retains its position as a chartered chapter of APO. |
| 1946: | Oliver "Lafe" Parks gives control of Parks Air College to Saint Louis University. |
| 1949: | Parks College begins petitioning as the Theta Xi chapter of Alpha Phi Omega |
| February 26, 1950: | Theta Xi receives its charter. |
| 1961: | Delta Delta makes efforts to regain membership. |
| 1971: | Delta Delta becomes an inactive chapter of Alpha Phi Omega. |
| 1989: | Efforts are put forth to reactivate Delta Delta. Leadership is found in a Rockhurst transfer student named Bea Stout who was initiated as a member of Alpha Phi Omega in the Gamma Xi chapter. |
| March 30-April 1 1990: | Delta Delta hosts the Region VIII Conference |
| March 31, 1990: | Delta Delta is reactivated with 55 members. Bea Stout receives the first Chapter Distinguished Service Key. |
| 1994: | The Family Program first appears in Delta Delta. Miguel Paniagua and Molley Wessel receive the only other recorded chapter DSKs to this point. |
| 1997: | Parks College is moved to the main SLU campus. Theta Xi and Delta Delta join under the charter of Delta Delta. |
| April 3-5, 1999: | Delta Delta hosts the Section 49 Conference. |
| 2000: | The new pledge class more than doubles the size of Delta Delta. The trend in very large pledge classes continues for the next few years. The Chapter Constitution is changed to create a larger Executive board, reflecting the growing chapter size. |
| Spring 2002: | Advisor Cindy Grubenhoff, current president Daniel Schniedermeier, and Vice-President of Recruitment and Pledge Education Lauren Rubenstein receive Chapter DSKs. The frist annual Spring Showers of Service draws 300 volunteers to the St. Louis community. |
| Spring 2003: | President Lori Ruhl leads efforts in a complete revamping of the Delta Delta constitution. Billy Brennon chairs the family heads in co-ordinating the first annual APO Family Olympics |
| Fall 2003: | President Megan Kinney updates the Chapter Risk Management Policy. Also, Delta Delta is named the largest chapter in the country. |
| Spring 2006: | Delta Delta hosts the Region 8 Conference. |
| Fall 2006: | New pledge class almost doubles the size of Delta Delta. |
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