Upvote:4
https://en.aegeanair.com/plan/fare-rules/ lists a bewildering number of cases based in fare class and route. Most international ones read something like this.
II. Flex Fare (Y, B, M, H, Q, V, L, K, S, T, U, P Class): The fare and taxes are refunded. There is a cancellation penalty of β¬50 per direction, paid by the passenger to the company. In case of no-show refund is not permitted.
I would interpret this as 50 Euro per direction per ticket, so the total cancellation fee would be 200 Euro or about half of the ticket price.
It's also not clear to me whether this would be an actual cash refund or just travel credit. You may have to call the airline and ask.