Lufthansa has flights from Dallas (DFW) to Athens (ATH) for $484-$519. Flights in March, October, November, December, and January. Flight may operate as a United code-share.Note: New Years is available if you can do an 11-day stay or longer.
Note: Fare allows for a free carry-on bag, but checked bags will cost about +$60 each-way. You can avoid paying a seat selection fee by accepting the free, randomly assigned, seat at the gate.