We plan on taking a ferry from Athens (Piraeus) to Santorini in late December and then fly to London from there. Is there still a ferry a day/every couple of days at this time of year? Ferry timetables don't come out until late and I'm not sure whether to book flights.
Santorini is a popular destination all year round and therefore ferry services does not stop - it's true that winter timetables come out late but you can be sure that you will find an itinerary that suits you. More info on www.danae.gr and www.openseas.gr
Have a nice journey over 10 years ago