That said, most one-way ferry tickets between Piraeus and the Greek islands should cost between 12 and 75 euros for a standard seat (business class seats or cabins are much more expensive).

The cost of Greek ferries varies wildly depending on the distance, the speed of the vessel, and the time of year. Generally, "slow" conventional ferries (like those operated by Blue Star) are quite affordable; a deck-class ticket for a 5-hour journey might cost between €30 and €50. In contrast, high-speed catamarans (like SeaJets) can cut travel time in half but often double the price, ranging from €70 to €100+ for a single leg. Routes to popular islands like Mykonos or Santorini during the peak July-August season command the highest prices and sell out weeks in advance. For those on a budget, booking "Economy" or "Deck" class on a large ferry is the most cost-effective way to travel, as it gives you access to all public areas and cafes without the price tag of a reserved seat or cabin. If you plan on doing significant island hopping, the Eurail Greek Islands Pass can sometimes save money, but it is often more restrictive than just booking individual tickets through platforms like Ferryhopper or Direct Ferries.