Delahunt was part of the Leinster age-group set up, captaining the province's under-19 side.
He joined Connacht on an initial three-month trial in the summer of 2014, training with the team and playing in a preseason friendly against Clermont Auvergne.
He represented Ireland in the Under-20s Six Nations in 2014.
Delahunt made 11 appearances in his debut season as a member of the Connacht senior squad and started in the number 2 jersey on four occasions.
Having graduated from the Connacht Academy in 2016 he currently has 65 caps to his name.
In May 2017, Delahunt signed a new deal with Connacht for the 2017/18 season and made 11 appearances, scoring 3 tries.
As of June 2020, he has made 77 appearances for the Irish province.
(LS June 24, 2020)
|2015 - present|
|2014 - 2015|
|2014 - 2023|