If you are arranging your own accommodation within San Stefanos and just need flights, here are the main providers for you to search for. Most offer direct flight from major UK airports to Kerkyra Airport in Corfu. If you are not travelling from the UK you may need to fly to Athens and catch a connecting flight to Corfu from there.
Easy Jet; http://www.easyjet.com/asp/en/book/index.asp?lang=en
Ryan Air; http://www.ryanair.com/en
Olympic (from Athens); http://www.olympicair.com/Home.aspx?a_id=549