Rantala debuted in the Finnish women's premier division Naisten Liiga at the age of 14.[3]
On 5 November 2015, Rantala was announced at TPS.[4]
On 11 November 2017, Rantala was announced at FC Honka.[5]
On her league debut for HJK, Rantala scored 4 goals against ONS on 23 March 2019.[6] In 2019, she was the league top scorer with 22 goals and was nominated as the Player of the Year.[7] In December 2019, Rantala was signed by the Swedish side Kristianstads DFF on a one year contract.[8]
In December 2021, Rantala joined Vittsjö GIK.[9] On 21 October 2022, she signed a new contract with Vittsjö GIK for the 2023 season.[10]
In August 2023, Rantala joined Leicester City in the Women's Super League, signing a two year contract.[11] She scored two goals on her league debut against Bristol City on 1 October 2023, scoring in the 49th and 83rd minute, winning the Player of the Match award.[12][13] After her first season with Leicester City, she won the Player of the Season award.[14]
Rantala was initially not called up to the Finland squad that won the 2023 Cyprus Women's Cup for the first time.[18] She was later called up to replace Tuija Hyyrynen, who had withdrawn from the squad due to injury.[19]
Rantala was part of the Finland squad that won the 2024 Pinatar Cup for the first time.[20]
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