Upvote:1
Here is the answer of your question: Yes , you can enter Turkey with e-visa does not matter from where do you go to Turkey.
However, I guess you wanted to ask something else. Then I would suggest to: -Explain the situation better! -Did you buy the tickets separately? -Do you have a checked-in luggage? -Does Aegean Airlines directly fly to Cairo from Istanbul? -Do you have a multiple entry schengen visa, if you need to enter Greece?