Onnarin has played on the LPGA of Japan Tour since 2011 where she claim three titles.

[1] She got her maiden title in Japan at the Hoken No Madoguchi Ladies in 2013 before taking the Daikin Orchid Ladies Golf Tournament title the following year.

[3] In 2014, she played in the Women's British Open but didn't make the cut.

[4] She represented Thailand in the International Crown team event.

[5] In 2017, she claimed her third win on the LPGA of Japan Tour at the Golf5 Ladies in Chiba.