I found this airport info on a hotel website.
How to Get to Thessaloniki
Thessaloniki International Airport Makedonia (SKG) Hyatt Regency Thessaloniki hotel is located near Thessaloniki International Airport – Makedonia (5 minutes by car). Many European airlines and charter companies fly direct from locations such as Paris, London, Berlin, Milan, Moscow, Cyprus, Amsterdam, Cologne, Frankfurt, Istanbul, and Budapest. All major airlines from the US, Asia, Europe, Africa, South America and the Middle East fly directly to Athens, with a 40-minute connection to Thessaloniki.
Thessaloniki is also connected with direct flights from major Greek destinations such as Crete (Heraklion and Chania), Rhodes, Santorini, and Mykonos.