Kiriakos Spanos has represented Cyprus at the 2008 European Junior Championships in Plovdiv; Junior World Championships 2009 in Yerevan; Junior World Championships 2010 in Bak; and at the Youth European Championships 2011.
In June 2011, he competed at the European Championships 2011 in Ankara , dropping out in the first duel  . At the 2013 Mediterranean Games in Mersin, he reached the quarterfinals, in which he lost to points with the Italian representative Luca Capuano  .
In 2014, he represented Cyprus at the 2014 Commonwealth Games in Glasgow . In the 1/16 finals he lost to Englishman Anthony Fowler , falling out of competition.