Kearns played five matches for the USA under-20's at the 2013 IRB Junior World Championship. Kearns also competed for the Irish Universities team in a 2016 match against an England Students side. Kearns was selected for the All-Americans three match tour of Australia in 2016, where he served as the team's starting fly-half in two of their three matches. Kearns made three appearances for the USA Selects during the 2018 Americas Pacific Challenge.