Ο Κώστας Υφαντής είναι Καθηγητής Διεθνών Σχέσεων στο Πάντειο Πανεπιστήμιο. Έχει εργαστεί στα πανεπιστήμια του Bradford, Portsmouth και ΕΚΠΑ. Επίσης, ήταν Επισκέπτης Ερευνητής στα Πανεπιστήμια Michigan, Ann Arbor (USIA Visiting Scholar 1998), Harvard (Fulbright Visiting Scholar 2002), LSE (Senior Research Fellow 2009) και Επισκέπτης Καθηγητής στο Πανεπιστήμιο της Seoul (2016). Την περίοδο 2012-2020 διετέλεσε Επισκέπτης Καθηγητής στο Πανεπιστήμιο Kadir Has της Κωνσταντινούπολης. Εργασίες του έχουν δημοσιευθεί σε συλλογικούς τόμους και επιστημονικές επιθεωρήσεις Democratization, Turkish Studies, Southeast European and Black Sea Studies, Perceptions, International Journal, International Relations, UNISCI Journal on International Relations and Security, Journal of Southern Europe and the Balkans, Global Review etc.
Στα βιβλία του περιλαμβάνονται: Greece in a Changing Europe, (co-ed., Manchester University Press, 1996); NATO in the New European Order, (Macmillan, 1996); Theory and Reform in the European Union, (Manchester University Press, 2002); and NATO and the New Security Paradigm, (Frank Cass 2002); Turkish-Greek Relations: The Security Dilemma in the Aegean, (co-ed., Routledge, 2004); International Security Today (co-ed., SAM, 2006); Multilateralism and Security Institutions in an Era of Globalization, (co-ed., Routledge, 2009); Turkey’s road to European Union membership: national identity and political change, (co-ed., Routledge, 2009). International Political Theory: The charm of realist discourse (in Greek, 2012); Is Europe Afraid of Europe? (ed., Wilfrid Martens Center, 2014); The Syrian Imbroglio: International and Regional Strategies (co-ed., The Robert Schuman Centre for Advanced Studies, European University Institute, 2017), “Deciphering the Greek Crisis: Issues, Failures, Challenges” (guest co-ed, Special Issue in International Relations/Uluslararasi Iliskiler, Vol 15, No 58, 2018).