Upvote:1
Actually, accommodation during November for Greek islands is going to be cheaper than the rest of the year. Also, flights to islands from mainland Greece are going to be cheaper (especially if you book in advance). The issue will be that only major hotels will be open rather than smaller family businesses/apartments.
So for flights, try Aegean Air, Ryanair, Astra Airlines or Sky Express. I found return flights to Corfu and Chania for less than β¬100 during November. I would not suggest going to small islands as hotels might be closed. Try what other options these airlines give during November, because ferries are scarce during November and not worth the trouble / price difference.
Upvote:7
I think going anywhere in Greece right now is going to very cheap (relatively) because of the economic/political situation.
The islands that make sense to see depend on where in Greece you are going. If you are say, flying into Athens, Mykonos/Delos is a close ferry away and are well worth seeing if you like ruins. From there you can ferry to Santorini if you like relaxing (or volcanoes).
You should be careful of the economic situation there. If you have a Greek bank card, you will be limited to 60 euro withdrawal limits. Even if you don't have a Greek bank card, in some locations there are reports of ATMs running out of cash. Thus, it might be safe to take a large portion of the money you expect to spend in cash with you ahead of time. Additionally, some smaller businesses are not taking credit cards at this time.
(As several people have commented, the economic and political situation in Greece should change drastically between now and November. My answer is based on the situation as of today.)