[01/06/2019 @ 6:46 PM] AA/Oneworld is matching.
Lufthansa has flights from Dallas (DFW) to Athens, Istanbul, or Zagreb (ATH/IST/ZAG) for $504-$520. Flights January to March. 7-day minimum stay required. Flight may operate as a United code-share.
Note: Fare allows for a free carry-on bag, but checked bags will cost about +$60 each-way.