Opodo pulls up both direct and indirect flight options for Athens to Philadelphia (United States) side by side. Rank them however suits you, by price or by schedule, and lock in the one that works.
On this route, fares have recently dipped as low as €642. What you end up paying hinges on the specific dates and flight times you select.
Going direct between Athens and Philadelphia takes around 12 h and 15 m. Choosing an indirect route will add to that travel time.