He was underage again for the 2014 All-Ireland Minor Football Championship. He won a second Munster title by overcoming Cork in the final scoring seven points in the final. Kerry qualified a first All-Ireland minor final since 2006 when they took on Donegal. Spillane scored five points as Kerry won the title for the first time since 1994.
Under 21
He joined the Kerry Under 21 team in 2016. Despite many of the 2014 MFC winning team Kerry lost out to Cork in the Munster final. He was back again in 2017 and again faced Cork in the Munster final. He scored five points as Kerry won the first Munster Under 21 title since 2008. They suffered a disappointing loss to Galway in the All-Ireland semi-final.
Junior
Spillane joined the Kerry Junior team in 2015. He joined the panel for the All-Ireland semi-final with Wexford, scoring a goal as a sub. He started in the All-Ireland final with Mayo, he scored two points as Kerry won the title for the first time since 2012.
He was back with the Junior team in 2017 as captain. He won his first Munster Junior title after overcoming Cork in the final. Kerry faced Meath in the final, in a game where Spillane scored three points to help his side to win and pick up a second All Ireland JFC title.
Senior
In the 2021 Munster final Spillane scored 0–2 as Kerry beat Cork 4–22 to 1–9. In the 2022 Munster final he scored 1–3 as Kerry beat Limerick 1–28 to 0–8. In the 2022 All-Ireland Senior Football Championship Final he came off the bench at half time and scored 0–2 as Kerry beat Galway 0–20 to 0–16.