He made his professional debut in a friendly match against English Premier League club West Bromwich Albion F.C.

[5] Durkin debuted for D.C. United on June 15, 2016, during a Lamar Hunt U.S. Open Cup fourth round tournament fixture, going 86 minutes against the Fort Lauderdale Strikers.

[6] On March 3, 2018, Durkin made his Major League Soccer debut against Orlando City, coming on in the 73rd minute for Yamil Asad.

Just a few weeks later on March 24, 2018, Durkin made his first professional start for United, going the entire 90 minutes in a 3–1 loss against Columbus Crew.

Durkin scored his first goal for the U.S. Under-17 team in a group stage match against Jamaica, and again in the U-17 World Cup against the host country of India.