[6][7] Having had minimal opportunities to play for younger age groups due to restrictions of the COVID-19 pandemic, Zubieta made her debut for Spain at under-19 level in October 2021 against Portugal.

She became a regular in the team and was a member of the squads which won the 2022 Euros in the Czech Republic followed by the 2022 FIFA U-20 Women's World Cup in Costa Rica[4] (alongside clubmates Ane Elexpuru and Clara Pinedo).

[8][9] She was still young enough to take part in the 2023 U-19 Euros in Belgium and again returned home with a gold medal,[10] this time accompanied by fellow Athletic players Jone Amezaga and Sara Ortega.

[11] Zubieta made her debut for the senior Spain team in November 2024, as a substitute in a 5–0 friendly victory over South Korea (club teammate Adriana Nanclares also gained a first cap, though as a starter).

[13] She has also been selected for the unofficial Basque Country women's national team which plays only occasionally, making her first appearance in December 2022 against Chile.