Onnicha Kamchomphu marked her T20I debut against India in June 2018. The off-spinner showcased her exceptional bowling prowess with remarkable figures of 4-6 in three overs during a match against Bhutan in the Thailand T20 Smash in January 2019. Her remarkable performance continued in August of the same year when she achieved a hat-trick against Ireland in the Quadrangular Series. Such outstanding displays earned her a well-deserved spot in Thailand’s squad for the ICC Women’s T20 World Cup 2020.