[09/20/2019 @ 02:17 PM CT] Deal is back on.
Lufthansa has round-trip flights from Dallas (DFW) to Athens (ATH) for $512 with a connection. Flights November to April. No Saturday departures. Midweek is cheapest. 7-day minimum stay required.
Note: Lufthansa “Light Fares” allow for 1 carry-on bag with a maximum weight restriction of 18-lbs. This will probably not be enough weight for those of you who wish to do a carry-on only trip. You can avoid seat selection fees by accepting the randomly assigned seat at the gate.
Note: There are some fares for $489 available on Air Canada, but those have very long connection times and bad routing.