Triathlon has been contested at the Southeast Asian Games three times, in 2005, 2007, 2015, 2017, 2019.
| 2005 Philippines | ||||
| 2007 Thailand | ||||
| 2015 Singapore[1] | ||||
| 2017 Malaysia | ||||
| 2019 Philippines | ||||
| 2021 Vietnam |
| 2005 Philippines | Not Held | ||
| 2007 Nakhon Ratchasima | |||
| 2015 Singapore | Not Held | ||
| 2017 Malaysia | Not Held | ||
| 2019 Philippines | Not Held | ||
| 2021 Vietnam | |||
| 2005 Philippines | ||||
| 2007 Thailand[2] | ||||
| 2015 Singapore | ||||
| 2017 Malaysia | ||||
| 2019 Philippines | ||||
| 2021 Vietnam |
| 2005 Philippines | Not Held | |||
| 2007 Thailand | ||||
| 2015 Singapore | Not Held | |||
| 2017 Malaysia | Not Held | |||
| 2019 Philippines | Not Held | |||
| 2021 Vietnam |
| 2019 Philippines | nowrap=true | John Leerams Chicano Kim Mangrobang Fernando Jose Casares Maria Claire Adorna | nowrap=true | Luke Chua Li Rong Herlene Natasha Yu Zhihui Bryce Chong Sheng Cher Emma Ada Middleditch | nowrap=true | Muhammad Ahlul Firman Nethavani Octaria Jauhari Johan Eva Desiana |
| 2021 Vietnam | Not Held |