 Koudas made 43 appearances for the Greece national team, scoring 4 goals, between 1967 and 1982.He appeared at UEFA Euro 1980 in Italy, along with PAOK teammates Konstantinos Iosifidis, Ioannis Damanakis, Ioannis Gounaris and Georgios Kostikos.After he had retired, Koudas made a final appearance for the national team in a friendly against Yugoslavia on 20 September 1995.