O'Flanagan made her debut for Ireland in July 2010 against Scotland.[8][9][15][38] In April 2011 she scored her first goal for Ireland against France.[39] In March 2015 O'Flanagan was a member of the Ireland team that won a 2014–15 Women's FIH Hockey World League Round 2 tournament hosted in Dublin, defeating Canada in the final after a penalty shoot-out.[40][41] In May 2015 she made her 100th appearance for Ireland and marked the occasion by scoring in a 3–1 win against Canada.[38] In January 2017 she was also a member of the Ireland team that won a 2016–17 Women's FIH Hockey World League Round 2 tournament in Kuala Lumpur, defeating Malaysia 3–0 in the final.[42]
O'Flanagan has been a regular goalscorer for Ireland. She scored 12 goals at the Kuala Lumpur tournament, including one in the final, which saw her pass the 50 mark.[7][8][9][43] She was also the leading goalscorer at the tournament.[2]
O'Flanagan represented Ireland at the 2018 Women's Hockey World Cup and was a prominent member of the team that won the silver medal.[3][44][45] She featured in all of Ireland's games throughout the tournament, including the pool games against the United States,[46]India,[47] and England,[48] the quarter-final against India,[49] the semi-final against Spain[50] and the final against the Netherlands.[51] During the tournament O'Flanagan scored twice. On 26 July 2018 she scored in the group game against India, securing a 1–0 win for Ireland and a place in the quarter-finals.[47][52][53][54][55] On 4 August 2018 she also scored in the semi-final against Spain. This was her 65th international goal which saw her become Ireland's joint all-time top scorer, along with Lynsey McVicker. She was subsequently named player of the match.[56][57]
^ ab"UCD – Women's Division One". www.hookhockey.com. 16 September 2011. Archived from the original on 11 August 2018. Retrieved 9 August 2018.{{cite news}}: CS1 maint: unfit URL (link)