Found that bit surprising one. For European startup long weekend in Greece isn't that special. The flights can be quite cheap and Greece generally isn't that expensive country. A few hundred all together could probably be done.
I’ve always been surprised by the flight costs of some European airlines. It seems cheaper to fly around Europe than it is to fly within the US. I recall during the peak of the pandemic some people I know posting pictures of $5 flights while in the US they were they were still 10-11 times that for domestic flights.