Campbell has so far earned over 90 caps for Costa Rica and was a member of the squad which won the 2014 Copa Centroamericana. He was also part of the Costa Rican side which reached the last eight of the 2014 FIFA World Cup, and played in the 2018 FIFA World Cup as well. Campbell also helped Costa Rica get to the quarter-finals of the 2015 CONCACAF Gold Cup and the semi-finals of the 2017 CONCACAF Gold Cup.